准噶尔盆地玛湖凹陷西斜坡南部区域三叠系百口泉组沉积与层序地层特征研究
发布时间：2018-08-04 11:28
【摘要】：玛湖凹陷西斜坡区位于玛湖凹陷西北部,东靠达巴松凸起与夏盐凸起,北临乌夏断裂带,南接中拐凸起,西抵克百断裂带,整体上是中央凹陷次一级东南倾斜的单一构造,论文重点研究和讨论的目的层是三叠系百口泉组地层。本文以岩性、粒度、测井、沉积特征作为参数,对研究区沉积相进行划分,该区总体发育扇三角洲和湖泊2种沉积相。扇三角洲沉积可以进一步划分为扇三角洲平原和扇三角洲前缘2种亚相。其中,扇三角洲平原亚相以辫状河道沉积微相为主;扇三角洲前缘亚相以水下分流河道沉积微相为主。湖泊相沉积可以分为滨湖和浅湖2种亚相,但因为滨湖亚相和浅湖亚相没有明显的区别特征,所以整体作为滨-浅湖亚相分析,滨浅湖亚相进一步可以划分为滨浅湖泥1种沉积微相。本文根据该区勘探现状,以层序地层学作为指导理论,运用沉积学、测井地层学、地震地层学原理,以地震反射、测井特征、岩芯和地质露头中的地层剥蚀、上超、沉积相突变等作为依据,对该区层序地层进行研究,发现该区整体发育5个以沉积旋回作为分界面的三级层序。目的层百口泉组地层整体为一个三级层序,再根据岩性和电性特征在垂直方向的变化,目的层进一步可以划分为三个四级层序,分别对应百一段,百二段和百三段。以百口泉组地层内部三段所对应的三个四级旋回作为单元,制作这三个四级层序中沉积相的平面分布图,研究各四级层序中沉积相的演化规律和分布特征,为预测该区有利储层相带的平面分布特征提供依据。研究区百口泉组储层孔隙度和渗透率值较低,其中孔隙度大小在5.0%～14.5%之间,平均值为8.45%;渗透率大小在0.04mD～96.50mD之间,平均值为2.10mD,整体上属于特低孔-渗储层,主要分布在百一段和百二段中的扇三角洲前缘亚相中,岩性以岩屑砂砾岩和长石砂砾岩为主。储集空间类型多样,有剩余粒间孔、粒内溶孔、粒间溶孔、收缩孔和微裂缝5种,主要以剩余粒间孔和粒内溶孔为主。这是由于储层岩石中存在的刚性颗粒具有一定的抗压实作用,对一部分原生粒间孔的保存提供了有利条件;另一方面,储层岩石中存在大量的长石且早期油气充注和地层异常高压的共同作用下,地层中发育了大量的粒内溶孔。在整体特低孔-渗储层的基础上,根据泥质含量、物性特征、排驱压力、喉道半径、粒度特征,研究区储层分为2种储层。1种为较好的储层,主要分布在百一段,岩性以细粒砂质砾岩、砾岩及含砾粗砂岩为主,物性和喉道结构相对都比较好;另一种为较差储层,主要分布在百二段,岩性以砂质细砾岩为主,物性中等,喉道结构较差。而百三段,基本为致密泥岩层,不具备储层条件,可以作为良好的盖层,为百口泉组油藏的形成提供有利条件。综合分析沉积、层序地层和储层特征,认为玛湖凹陷西斜坡南部区域百口泉组有利储层分布在百一段和百二段地层中。百一段中,研究区整体为有利储层带集中分布在扇三角洲前缘亚相中;百二段中,有利储层分布在研究区北部,集中分布在北部扇三角洲前缘亚相和西北部平原亚相沉积中。
[Abstract]:The western slope area of the Ma Hu sag is located in the northwest of the Ma Hu sag, the east of the dabasone uplift and the Xia salt uplift, the north facing the wuxia fault zone, the South connection in the middle abduction uplift and the West offset fault zone, on the whole the single structure of the south-east slope of the central depression at the secondary level. The main research and discussion of the paper is the Triassic hundred mouth spring formation. This paper is based on lithology, The grain size, logging and sedimentary features are divided into 2 sedimentary facies of the fan delta and lake in this area. Fan delta deposits can be further divided into 2 subfacies of fan delta plain and fan delta front, of which the fan delta plain subfacies is dominated by braided channel sedimentary microfacies; The predominant subfacies are mainly subaqueous distributary channel sedimentary microfacies. The lacustrine facies can be divided into 2 subfacies of Binhu and shallow lakes, but because the Binhu subfacies and shallow lake subfacies have no distinct distinguishing features, the whole as the coastal shallow lake subfacies analysis, the shore shallow lake subfacies can be further divided into 1 sedimentary microfacies of the shore shallow lake mud. By using sequence stratigraphy as a guiding theory, using the principles of sedimentology, logging stratigraphy and seismic stratigraphy, based on seismic reflection, logging features, core and geological outcrop formation erosion, supra, sedimentary facies mutation and so on, the sequence stratigraphy of this area was studied, and 5 sedimentary cycles were found to be the interface of the region as a whole. The three order sequence of the target layer is a three order sequence in the bakou Quan formation, and then according to the vertical changes in the lithologic and electrical characteristics. The target layer can be further divided into three four order sequences, respectively, corresponding to the hundred first, the second and the hundred third segments, and three four stage cycles corresponding to the three segments of the inner part of the bakou spring formation. The plane distribution map of the sedimentary facies in these three four sequence sequences is made to study the evolution law and distribution characteristics of sedimentary facies in each four order sequence, which provides a basis for predicting the plane distribution characteristics of the favorable reservoir facies belt in this area. The porosity and permeability of the reservoir in the study area are low, the size of the porosity is between 5% and 14.5%, and the average value of the reservoir is between them. The permeability is 8.45%. The permeability is between 0.04mD and 96.50mD, with an average value of 2.10mD, which belongs to the ultra low porosity and permeability reservoir, mainly in the fan delta front subfacies in the first and second segments. The lithology is dominated by lithic sand conglomerate and feldspar conglomerate, with many types of reservoir space, residual intergranular pores, intergranular pore solution, intergranular pore solution and contraction. There are 5 kinds of pores and micro cracks, mainly due to the remaining intergranular pores and intragranular holes. This is because the rigid particles in the reservoir rocks have certain anti compaction effects and provide favorable conditions for the preservation of a part of the primary intergranular pores; on the other hand, there are a large number of feldspar in the reservoir rocks and the early oil gas filling and abnormal high pressure in the formation. Under the common action, a large number of intragranular holes are developed in the formation. On the basis of the overall low porosity and permeability reservoir, according to the shale content, physical properties, displacement pressure, throat radius and grain size, the reservoir is divided into 2 kinds of reservoir.1, mainly distributed in the first one, and the lithology is fine-grained sandy conglomerate, conglomerate and gravel coarse sand. The rock is relatively good; the other is relatively poor in physical and laryngeal structure, and the other is a poor reservoir, mainly distributed in the second section. The lithology is mainly sandy conglomerate, with medium physical property and poor structure of the larynx. Comprehensive analysis of sedimentary, sequence stratigraphy and reservoir characteristics suggests that the favorable reservoirs in the southern part of the western slope of the western slope of the Ma Hu depression are distributed in the first and the second strata of the 100 section. In the first part of the study area, the favorable reservoir zones are centrally distributed in the fan delta front subfacies, and the favorable reservoirs are distributed in the northern part of the study area and concentrated in the northern part of the study area. It is distributed in the northern fan delta front subfacies and the northwest plains subfacies.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P539.2;P534.51
[Abstract]:The western slope area of the Ma Hu sag is located in the northwest of the Ma Hu sag, the east of the dabasone uplift and the Xia salt uplift, the north facing the wuxia fault zone, the South connection in the middle abduction uplift and the West offset fault zone, on the whole the single structure of the south-east slope of the central depression at the secondary level. The main research and discussion of the paper is the Triassic hundred mouth spring formation. This paper is based on lithology, The grain size, logging and sedimentary features are divided into 2 sedimentary facies of the fan delta and lake in this area. Fan delta deposits can be further divided into 2 subfacies of fan delta plain and fan delta front, of which the fan delta plain subfacies is dominated by braided channel sedimentary microfacies; The predominant subfacies are mainly subaqueous distributary channel sedimentary microfacies. The lacustrine facies can be divided into 2 subfacies of Binhu and shallow lakes, but because the Binhu subfacies and shallow lake subfacies have no distinct distinguishing features, the whole as the coastal shallow lake subfacies analysis, the shore shallow lake subfacies can be further divided into 1 sedimentary microfacies of the shore shallow lake mud. By using sequence stratigraphy as a guiding theory, using the principles of sedimentology, logging stratigraphy and seismic stratigraphy, based on seismic reflection, logging features, core and geological outcrop formation erosion, supra, sedimentary facies mutation and so on, the sequence stratigraphy of this area was studied, and 5 sedimentary cycles were found to be the interface of the region as a whole. The three order sequence of the target layer is a three order sequence in the bakou Quan formation, and then according to the vertical changes in the lithologic and electrical characteristics. The target layer can be further divided into three four order sequences, respectively, corresponding to the hundred first, the second and the hundred third segments, and three four stage cycles corresponding to the three segments of the inner part of the bakou spring formation. The plane distribution map of the sedimentary facies in these three four sequence sequences is made to study the evolution law and distribution characteristics of sedimentary facies in each four order sequence, which provides a basis for predicting the plane distribution characteristics of the favorable reservoir facies belt in this area. The porosity and permeability of the reservoir in the study area are low, the size of the porosity is between 5% and 14.5%, and the average value of the reservoir is between them. The permeability is 8.45%. The permeability is between 0.04mD and 96.50mD, with an average value of 2.10mD, which belongs to the ultra low porosity and permeability reservoir, mainly in the fan delta front subfacies in the first and second segments. The lithology is dominated by lithic sand conglomerate and feldspar conglomerate, with many types of reservoir space, residual intergranular pores, intergranular pore solution, intergranular pore solution and contraction. There are 5 kinds of pores and micro cracks, mainly due to the remaining intergranular pores and intragranular holes. This is because the rigid particles in the reservoir rocks have certain anti compaction effects and provide favorable conditions for the preservation of a part of the primary intergranular pores; on the other hand, there are a large number of feldspar in the reservoir rocks and the early oil gas filling and abnormal high pressure in the formation. Under the common action, a large number of intragranular holes are developed in the formation. On the basis of the overall low porosity and permeability reservoir, according to the shale content, physical properties, displacement pressure, throat radius and grain size, the reservoir is divided into 2 kinds of reservoir.1, mainly distributed in the first one, and the lithology is fine-grained sandy conglomerate, conglomerate and gravel coarse sand. The rock is relatively good; the other is relatively poor in physical and laryngeal structure, and the other is a poor reservoir, mainly distributed in the second section. The lithology is mainly sandy conglomerate, with medium physical property and poor structure of the larynx. Comprehensive analysis of sedimentary, sequence stratigraphy and reservoir characteristics suggests that the favorable reservoirs in the southern part of the western slope of the western slope of the Ma Hu depression are distributed in the first and the second strata of the 100 section. In the first part of the study area, the favorable reservoir zones are centrally distributed in the fan delta front subfacies, and the favorable reservoirs are distributed in the northern part of the study area and concentrated in the northern part of the study area. It is distributed in the northern fan delta front subfacies and the northwest plains subfacies.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P539.2;P534.51
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