大牛地气田大47-大70井区山西组储层特征研究
发布时间：2019-02-15 02:02
【摘要】：大牛地气田大47-大70井区位于鄂北盆地东北部,其构造位置在伊陕斜坡北部,是华北分公司乃至中石化的重点天然气勘探开发区。山西组是本区的重点层位之一,但是由于其复杂的地质条件和成岩作用,使得储层致密,非均质性强,控制储层发育的主要因素和天然气成藏特征不明确,以上因素均阻碍气田的进-步开发。本次研究以石油地质学、沉积学、储层地质学、测井地质学等理论为指导,利用岩心及其分析化验和试气等资料对工区沉积相特征和储层特征等进行分析与探讨,取得了以下几点认识：1、运用传统沉积旋回与高分辨率层序地层学相结合的方法对研究区171口井的原有分层进行复核,将工区山西组划分为两段,即山1段和山2段,山2段分为两个砂组,即S2-2和S2-I；山1段分为三个砂组,即S1-3、S1-2和S1-1。2、物源及沉积相分析研究表明：工区山西组物源主要来自东北部,发育三角洲平原亚相,包括水上分流河道、溢岸砂、决口扇、间湾4种微相。3、岩石学特征分析研究表明：山西组主要为岩屑砂岩及岩屑质石英砂岩,砂岩成分成熟度偏低,颗粒分选较好,磨圆度较差,以次棱-次圆为主。孔隙式胶结是其主要的胶结类型,工区也发育一定的薄膜-孔隙式胶结。泥晶灰质、泥质、长英质等构成的杂基和白云石、硅质、方解石、硅质等构成的胶结物是填隙物的主要类型。4、通过对铸体薄片、普通薄片和扫描电镜等资料的分析,认为研究区主要孔隙类型为粒间孔隙、粒内孔隙、填隙物内孔隙、溶蚀粒内孔隙及溶蚀裂缝孔隙等五种孔隙类型,以粒间溶蚀孔隙为主,次生粒内溶孔为辅。喉道类型可划分为收缩喉道、片状喉道和微喉道,并以微喉道和片状喉道为主。5、根据毛管压力曲线形态和孔隙结构参数分布情况,将研究区孔隙结构划分为四类,Ⅰ类为较低门槛压力低孔低渗细喉型、Ⅱ类为低门槛压力低孔特低渗较细喉、Ⅲ类为中门槛压力特低孔超低渗微细喉、Ⅳ类为高门槛压力超低孔超低渗微细喉；大牛地气田孔隙结构复杂,其参数变化较大,中值半径相对偏小,排驱压力偏高,最大进汞饱和度高,但退汞效率低,岩石总孔隙度中有效孔隙度所占比例小,渗流能力差。6、根据研究区自生矿物分布、形成顺序、包裹体测温、有机质成熟度、古温度及各种成岩现象的分析,认为山西组地层整体处于中成岩A阶段。研究区目的层发育斑状溶蚀孔隙胶结成岩相(一类成岩相)、碳酸盐致密胶结成岩相(二类成岩相)、粘土致密胶结成岩相(三类成岩相)、致密压实成岩相(四类成岩相)。研究区主力产层储层成岩相总体为一、二类成岩相,三类成岩相储层产能较差,四类成岩相储层产能很差,基本不能形成工业气藏。7、影响研究区储层物性的主要因素为：沉积作用和成岩作用。沉积作用主要包括沉积微相、碎屑组分、碳酸盐胶结物及填隙物4个方面,其中水上分流河道等微相储层物性最好,其次为决口扇微相。碎屑组分中长石、岩屑含量与物性具有一定正相关；碳酸盐和填隙物含量与物性呈负相关关系；成岩作用包括压实、胶结、溶解及交代作用,其中压实、胶结和交代作用使储层物性变差,而溶解作用增大储层的孔渗性。8、利用岩性、物性、电性、含气性等标准确定有效厚度下限,山西组气藏储层孔隙度下限为5%,渗透率下限为0.1mD,含气饱和度下限为45%。9、针对储层的综合性能,选用岩性、孔隙度、渗透率,中值半径、排驱压力、成岩相类型,微相类型、有效厚度、含气饱和度和无阻流量等参数作为储层综合评价的特征参数,对研究区储层进行综合评价。将研究区的储层综合性能划分为一类、二类、三类、四类。研究区目的层以三类、四类储层为主,二类储层次之,一类储层相对较少。
[Abstract]:The large 47-large 70-well area of the large-scale cattle-ground gas field is located in the north-eastern part of the northern Hubei basin, and its tectonic position is in the northern part of the western Hubei Province, and it is the key natural gas exploration and development zone of the North China Branch and the Sinopec. The Shanxi Formation is one of the key horizons in this area, but due to its complicated geological conditions and diagenesis, the reservoir is dense and non-homogeneous, and the main factors of controlling the development of the reservoir and the reservoir characteristics of the natural gas are not clear, and the above factors all hinder the development of the gas field. Based on the theories of petroleum geology, sedimentology, reservoir geology, logging geology and so on, the paper analyzes and discusses the sedimentary facies and reservoir characteristics of the work area by using the core and its analysis and analysis and test gas. According to the method of combination of the traditional sedimentary cycle and the high-resolution layer sequence stratigraphy, the original layering of the 171 wells in the study area is reviewed, and the Shanxi Formation in the work area is divided into two sections, namely, the mountain 1 section and the mountain 2 section, and the mountain 2 section is divided into two sand groups, namely, S2-2 and S2-I, and the mountain 1 section is divided into three sand groups, namely, S1-3, The results of the analysis of S1-2 and S1-1.2, the source of material and the sedimentary facies show that the source of the Shanxi Formation in the work area is mainly from the north-east and the development of the sub-facies of the delta plain, including 4 kinds of micro-facies of the water distributary channel, the overflow sand, the decision-making fan and the bay bay. The Shanxi Formation is mainly rock-rock and rock-rock quartz sandstone, with low maturity of the sandstone component, good particle sorting and poor roundness, and the secondary-secondary-circle is the main. The pore-type cementation is the main cementing type, and the work area also has a certain film-pore type cementation. It is the main type of the interstitial material, and the main pore type of the study area is the inter-grain pore by the analysis of the data of the cast body, the normal sheet and the scanning electron microscope. The pores in the grains, the pores in the interstitial, the pores in the dissolved particles and the pores of the corrosion crack are the main types of pores, which are mainly dissolved in the intergranular corrosion pores, and the secondary particles are supplemented by the internal dissolution pores. the throat type can be divided into a contraction throat, a sheet-shaped throat and a micro-throat, and is mainly composed of a micro-throat and a sheet-shaped throat. The type II is low-threshold pressure, low-porosity, low-permeability, low-permeability, low-permeability, ultra-low-permeability micro-throat, type IV is the ultra-low-porosity ultra-low-permeability micro-throat with high threshold pressure, the pore structure of the large-scale gas-field gas field is complex, the parameter change is large, the middle value radius is relatively small, and the displacement pressure is high, the maximum mercury saturation is high, but the mercury removal efficiency is low, the effective porosity in the total porosity of the rock is small and the seepage capacity is poor. It is considered that the whole formation of Shanxi Formation is in the middle diagenetic A stage. The purpose of the study is to develop the plaque-like dissolution pore-cemented diagenetic facies (a kind of diagenetic facies), the carbonate-dense cemented diagenetic facies (the second-class diagenetic facies), the clay-dense cemented diagenetic facies (three types of diagenetic facies), and the compact and compact diagenetic facies (four types of diagenetic facies). The diagenetic facies of the main production layer of the research area are generally one, the second-class diagenetic facies, the three types of diagenetic facies have poor production capacity, and the four types of diagenetic facies have poor production capacity and can not form the industrial gas reservoir. It mainly includes four aspects, such as the deposition of the micro-phase, the component of the debris, the cementation of the carbonate and the interstitial matters, in which the physical properties of the micro-phase reservoirs such as the water-distributing channel and the like are the best, followed by the micro-phase of the decision-making fan. The content of feldspar and debris in the component of the debris is positively related to the physical property, and the content of the carbonate and the interstitial substance is in a negative correlation with the physical property. The diagenesis includes compaction, cementation, dissolution and cross-generation, in which the physical property of the reservoir is degraded by the action of compaction, cementation and cross-generation. and the effective thickness and lower limit are determined by using the criteria such as lithology, physical property, electrical property, gas-bearing property and the like, the lower limit of the porosity of the gas storage reservoir in the Shanxi group is 5%, the lower limit of the permeability is 0. 1mD, and the lower limit of the gas saturation is 45%. The parameters of porosity, permeability, medium value radius, displacement pressure, diagenetic facies type, micro-facies type, effective thickness, gas saturation and open flow are used as characteristic parameters of comprehensive evaluation of the reservoir, and the reservoir of the study area is comprehensively evaluated. The comprehensive performance of the reservoir in the study area can be divided into one, two, three, and four types. The target layer of the study area is divided into three types, four types of reservoirs as the main, and the second type of reservoir is of relatively small type.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
本文编号：2422848
[Abstract]:The large 47-large 70-well area of the large-scale cattle-ground gas field is located in the north-eastern part of the northern Hubei basin, and its tectonic position is in the northern part of the western Hubei Province, and it is the key natural gas exploration and development zone of the North China Branch and the Sinopec. The Shanxi Formation is one of the key horizons in this area, but due to its complicated geological conditions and diagenesis, the reservoir is dense and non-homogeneous, and the main factors of controlling the development of the reservoir and the reservoir characteristics of the natural gas are not clear, and the above factors all hinder the development of the gas field. Based on the theories of petroleum geology, sedimentology, reservoir geology, logging geology and so on, the paper analyzes and discusses the sedimentary facies and reservoir characteristics of the work area by using the core and its analysis and analysis and test gas. According to the method of combination of the traditional sedimentary cycle and the high-resolution layer sequence stratigraphy, the original layering of the 171 wells in the study area is reviewed, and the Shanxi Formation in the work area is divided into two sections, namely, the mountain 1 section and the mountain 2 section, and the mountain 2 section is divided into two sand groups, namely, S2-2 and S2-I, and the mountain 1 section is divided into three sand groups, namely, S1-3, The results of the analysis of S1-2 and S1-1.2, the source of material and the sedimentary facies show that the source of the Shanxi Formation in the work area is mainly from the north-east and the development of the sub-facies of the delta plain, including 4 kinds of micro-facies of the water distributary channel, the overflow sand, the decision-making fan and the bay bay. The Shanxi Formation is mainly rock-rock and rock-rock quartz sandstone, with low maturity of the sandstone component, good particle sorting and poor roundness, and the secondary-secondary-circle is the main. The pore-type cementation is the main cementing type, and the work area also has a certain film-pore type cementation. It is the main type of the interstitial material, and the main pore type of the study area is the inter-grain pore by the analysis of the data of the cast body, the normal sheet and the scanning electron microscope. The pores in the grains, the pores in the interstitial, the pores in the dissolved particles and the pores of the corrosion crack are the main types of pores, which are mainly dissolved in the intergranular corrosion pores, and the secondary particles are supplemented by the internal dissolution pores. the throat type can be divided into a contraction throat, a sheet-shaped throat and a micro-throat, and is mainly composed of a micro-throat and a sheet-shaped throat. The type II is low-threshold pressure, low-porosity, low-permeability, low-permeability, low-permeability, ultra-low-permeability micro-throat, type IV is the ultra-low-porosity ultra-low-permeability micro-throat with high threshold pressure, the pore structure of the large-scale gas-field gas field is complex, the parameter change is large, the middle value radius is relatively small, and the displacement pressure is high, the maximum mercury saturation is high, but the mercury removal efficiency is low, the effective porosity in the total porosity of the rock is small and the seepage capacity is poor. It is considered that the whole formation of Shanxi Formation is in the middle diagenetic A stage. The purpose of the study is to develop the plaque-like dissolution pore-cemented diagenetic facies (a kind of diagenetic facies), the carbonate-dense cemented diagenetic facies (the second-class diagenetic facies), the clay-dense cemented diagenetic facies (three types of diagenetic facies), and the compact and compact diagenetic facies (four types of diagenetic facies). The diagenetic facies of the main production layer of the research area are generally one, the second-class diagenetic facies, the three types of diagenetic facies have poor production capacity, and the four types of diagenetic facies have poor production capacity and can not form the industrial gas reservoir. It mainly includes four aspects, such as the deposition of the micro-phase, the component of the debris, the cementation of the carbonate and the interstitial matters, in which the physical properties of the micro-phase reservoirs such as the water-distributing channel and the like are the best, followed by the micro-phase of the decision-making fan. The content of feldspar and debris in the component of the debris is positively related to the physical property, and the content of the carbonate and the interstitial substance is in a negative correlation with the physical property. The diagenesis includes compaction, cementation, dissolution and cross-generation, in which the physical property of the reservoir is degraded by the action of compaction, cementation and cross-generation. and the effective thickness and lower limit are determined by using the criteria such as lithology, physical property, electrical property, gas-bearing property and the like, the lower limit of the porosity of the gas storage reservoir in the Shanxi group is 5%, the lower limit of the permeability is 0. 1mD, and the lower limit of the gas saturation is 45%. The parameters of porosity, permeability, medium value radius, displacement pressure, diagenetic facies type, micro-facies type, effective thickness, gas saturation and open flow are used as characteristic parameters of comprehensive evaluation of the reservoir, and the reservoir of the study area is comprehensively evaluated. The comprehensive performance of the reservoir in the study area can be divided into one, two, three, and four types. The target layer of the study area is divided into three types, four types of reservoirs as the main, and the second type of reservoir is of relatively small type.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
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本文编号：2422848
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