梨树断陷秦家屯油气田—十屋八井井区—太平庄构造地区沙河子组沉积特征研究
发布时间：2018-11-15 22:01
【摘要】：梨树断陷位于松辽盆地东南隆起区,自1980年起开始油气勘探,分为中央构造带、东南斜坡带、北部斜坡区和西部断褶区。研究区秦家屯油气田位于东南斜坡带,十屋八井井区-太平庄构造地区位于中央构造带。目前中央构造带、东南斜坡带主力油气层位是白垩系登娄库组和泉头组,但深部层位如沙河子组仍是未来勘探开发的重点。本论文以高分辨率层序地层学、沉积学理论为指导,在岩心、测井、地震资料等的精细分析基础上,对研究区沙河子组地层做了详细对比和划分,并系统研究了沙河子组的沉积特征,分析了沉积特征与油气成藏的关系,取得了以下认识和成果：(1)通过地质与地球物理相结合的方法,利用地震数据中标定的T41和T5(或T42)反射面来确定沙河子组的顶底界线。利用测井解释中的高GR泥岩的顶界作为沙河子组沙Ⅱ段和沙Ⅰ段的划分标志层,沙Ⅲ段与沙Ⅱ段以测井曲线GR和AC的变化为识别标准,在曲线变化的台阶处为划分标志。将秦家屯油田和十屋八井井区的沙河子组地层划分为三段,太平庄地区处于构造高部位,在水体较浅时沉积间断,缺失沙Ⅰ段沉积,划分为两段。(2)通过岩心观察、岩心相、测井相、单井相、连井相、沉积演化与沉积模式等分析,结合砂岩厚度等值线图、砂地比值等值线图、沉积相平面图等图件,对研究区沙河子组沉积特征进行分析。结果表明,研究区内沙河子组主要存在湖泊沉积和三角洲沉积(包括扇三角洲、辫状河三角洲、曲流河三角洲),共识别出10种亚相21种微相。主要存在有三个物源体系,分别是来自研究区东南部的秦家屯油气田物源体系、东北部的十屋八井井区物源体系与北部的太平庄构造物源体系,西部主要为浅湖-半深湖沉积。(3)在沉积特征分析的基础上,结合对研究区构造特征和断层活动期次的分析,认为秦家屯油气田和太平庄构造地区砂岩、砂砾岩发育,地层埋藏浅,暗色泥岩难以生烃,油气来自于西侧的凹陷区,运移通道为连通性较好的砂体和不整合面。油气远距离运移,以构造油气藏为主。十屋八井区沙河子组沉积时,处于构造的低部位,其沉积特征与秦家屯油气田、太平庄构造地区明显不同,以湖相沉积为主,易于形成构造-岩性复合油气藏。
[Abstract]:Lish fault depression is located in the southeast uplift area of Songliao Basin. Since 1980, oil and gas exploration has been started. It can be divided into central structural belt, southeast slope zone, northern slope area and western fault fold area. The Qinjiatun oil and gas field is located in the southeast slope zone, and the Shiwu-Taipingzhuang structural area is located in the central structural belt. At present, the main oil and gas formations in the central structural belt and southeastern slope belt are the Cretaceous Denglouku formation and the Quantou formation, but the deep strata such as the Shahezi formation are still the focus of exploration and development in the future. Guided by the theory of high-resolution sequence stratigraphy and sedimentology and on the basis of fine analysis of core, logging and seismic data, the strata of Shahezi formation in the study area are compared and divided in detail. The sedimentary characteristics of Shahezi formation are systematically studied, and the relationship between sedimentary characteristics and hydrocarbon accumulation is analyzed. The results are as follows: (1) through the combination of geology and geophysics, The top and bottom boundaries of the Shahezi formation are determined by using the T41 and T5 (or T42) reflectance surfaces calibrated in the seismic data. The top boundary of high GR mudstone in logging interpretation is used as the division marker of Shahezi formation and Shahezi formation. The variation of GR and AC in logging curve is used as the identification standard and the division mark is used at the step of curve change between Shahezi formation and Shahezi formation, and the variation of GR and AC in logging curve is regarded as the identification standard between Shahezi formation and Shahezi formation. The formation of Shahezi formation in Qinjiatun Oilfield and Shiwu well area is divided into three sections. Taipingzhuang area is located in a high structural position, with sedimentary discontinuity when the water is shallow, and the missing sand I member is divided into two sections. (2) through core observation, Core facies, logging facies, single well facies, contiguous well facies, sedimentary evolution and sedimentary model are analyzed. The sedimentary characteristics of Shahezi formation in the study area are analyzed in combination with sandstone thickness isoline map, sandground ratio isoline map, sedimentary facies plane map and so on. The results show that there are mainly lacustrine and delta deposits (including fan delta, braided river delta and meandering river delta) in the Shahezi formation, and 10 subfacies and 21 microfacies are identified. There are mainly three source systems, namely, the source system of Qinjiatun oil and gas field in the southeast of the study area, the material source system of Shiwu well area in the northeast and the source system of Taipingzhuang structure in the north. The west is mainly composed of shallow lacustry-semi-deep lake sediments. (3) based on the analysis of sedimentary characteristics, combined with the analysis of structural characteristics and fault activity stages in the study area, it is considered that sandstone and gravel are developed in Qinjiatun oil and gas field and Taipingzhuang structural area. The formation is shallow buried, dark mudstone is difficult to generate hydrocarbon, oil and gas come from the depression in the west, and the migration channel is sand body and unconformity surface with good connectivity. The long distance migration of oil and gas is dominated by structural reservoirs. The Shahezi formation in Shiwu well area is in the lower part of the structure, and its sedimentary characteristics are obviously different from those in Qinjiatun oil and gas field and Taipingzhuang structural area. The lacustrine facies is the main sedimentary area, and it is easy to form a structure-lithologic compound oil and gas reservoir.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
本文编号：2334520
[Abstract]:Lish fault depression is located in the southeast uplift area of Songliao Basin. Since 1980, oil and gas exploration has been started. It can be divided into central structural belt, southeast slope zone, northern slope area and western fault fold area. The Qinjiatun oil and gas field is located in the southeast slope zone, and the Shiwu-Taipingzhuang structural area is located in the central structural belt. At present, the main oil and gas formations in the central structural belt and southeastern slope belt are the Cretaceous Denglouku formation and the Quantou formation, but the deep strata such as the Shahezi formation are still the focus of exploration and development in the future. Guided by the theory of high-resolution sequence stratigraphy and sedimentology and on the basis of fine analysis of core, logging and seismic data, the strata of Shahezi formation in the study area are compared and divided in detail. The sedimentary characteristics of Shahezi formation are systematically studied, and the relationship between sedimentary characteristics and hydrocarbon accumulation is analyzed. The results are as follows: (1) through the combination of geology and geophysics, The top and bottom boundaries of the Shahezi formation are determined by using the T41 and T5 (or T42) reflectance surfaces calibrated in the seismic data. The top boundary of high GR mudstone in logging interpretation is used as the division marker of Shahezi formation and Shahezi formation. The variation of GR and AC in logging curve is used as the identification standard and the division mark is used at the step of curve change between Shahezi formation and Shahezi formation, and the variation of GR and AC in logging curve is regarded as the identification standard between Shahezi formation and Shahezi formation. The formation of Shahezi formation in Qinjiatun Oilfield and Shiwu well area is divided into three sections. Taipingzhuang area is located in a high structural position, with sedimentary discontinuity when the water is shallow, and the missing sand I member is divided into two sections. (2) through core observation, Core facies, logging facies, single well facies, contiguous well facies, sedimentary evolution and sedimentary model are analyzed. The sedimentary characteristics of Shahezi formation in the study area are analyzed in combination with sandstone thickness isoline map, sandground ratio isoline map, sedimentary facies plane map and so on. The results show that there are mainly lacustrine and delta deposits (including fan delta, braided river delta and meandering river delta) in the Shahezi formation, and 10 subfacies and 21 microfacies are identified. There are mainly three source systems, namely, the source system of Qinjiatun oil and gas field in the southeast of the study area, the material source system of Shiwu well area in the northeast and the source system of Taipingzhuang structure in the north. The west is mainly composed of shallow lacustry-semi-deep lake sediments. (3) based on the analysis of sedimentary characteristics, combined with the analysis of structural characteristics and fault activity stages in the study area, it is considered that sandstone and gravel are developed in Qinjiatun oil and gas field and Taipingzhuang structural area. The formation is shallow buried, dark mudstone is difficult to generate hydrocarbon, oil and gas come from the depression in the west, and the migration channel is sand body and unconformity surface with good connectivity. The long distance migration of oil and gas is dominated by structural reservoirs. The Shahezi formation in Shiwu well area is in the lower part of the structure, and its sedimentary characteristics are obviously different from those in Qinjiatun oil and gas field and Taipingzhuang structural area. The lacustrine facies is the main sedimentary area, and it is easy to form a structure-lithologic compound oil and gas reservoir.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
【参考文献】
相关期刊论文 前1条
1 刘计勇;兰正凯;皮定成;;松辽盆地南部十屋断陷层沉积体系类型及特征[J];内蒙古石油化工;2008年22期
，本文编号：2334520
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