吴起油田曾岔区延长组长9储层评价与油藏主控因素研究
发布时间：2019-03-15 18:31
【摘要】：吴起油田曾岔区块位于鄂尔多斯盆地伊陕斜坡中部,三叠系延长组作为该区主要含油层系,近年来长9油层组油气勘探取得了重大突破,但石油地质综合研究程度尚低。论文以储层地质学、油气成藏理论为指导,综合岩石薄片、物性、压汞等分析测试及试油试采资料,系统研究延长组长9油层组储层特征及其油藏控制因素,可以为该区下步勘探部署提供依据。研究表明,长9油层组划分为长91、长92和长93共3个小层,其中长91油层是主要的含油层位,各小层顶面构造总体表现为东高西低的单斜构造,局部发育由差异压实作用造成的鼻状隆起;长9油层组为三角洲前缘亚相沉积,水下分流河道为砂体主要成因类型;储层岩石类型主要为灰色细粒长石砂岩;储层建设性成岩作用有溶蚀作用和破裂作用,破坏性成岩作用有压实、压溶和胶结作用,总体处于中成岩A期;储层储集空间类型主要以粒间孔和长石溶孔为主,其余为少量岩屑溶孔、晶间溶孔、微孔和微裂缝孔,孔隙结构复杂;储层孔隙度平均为8.90%,渗透率平均为0.46×10-3μm2,总体为低孔—超低渗储层,储层非均质性强。长9油藏为典型的岩性油藏,油藏分布受烃源岩、过剩压力、沉积微相、成岩作用改造的控制。研究区发育的优质烃源岩为长9油藏的形成提供了良好的物质基础;同时研究区处于过剩压力低压区,是油气运移的有利指向区域,水下分流河道砂体的展布形态和特征,原生粒间孔的保存和次生孔隙的发育是控制长9油气聚集的最根本因素,分流河道主砂体及物性高值区是油气聚集的主要区域。将沉积微相、砂体厚度、储层物性,油层厚度和试油产量作为油气有利区的划分参数并预测了有利区,其中Ⅰ类有利区有三个,Ⅱ类有利区有两个,Ⅲ类有利区两个,为下一步勘探开发提供有利依据。
[Abstract]:Zengcha block in Wuqi Oilfield is located in the middle of the Yishan slope in Ordos Basin. As the main oil-bearing system in this area, the Triassic Yanchang formation has made a great breakthrough in oil and gas exploration in Chang-9 formation in recent years, but the comprehensive study of petroleum geology is still low. Under the guidance of reservoir geology and the theory of oil and gas accumulation, the characteristics and reservoir control factors of Yanchang-9 reservoir formation are systematically studied by integrating the analysis, test and production data of rock sheet, physical property, mercury pressure and so on. It can provide the basis for the next exploration and deployment of the area. The results show that the Chang-9 formation is divided into three sub-layers: Chang-91, Chang-92 and Chang-93, in which Chang-91 reservoir is the main oil-bearing layer, and the top structure of each layer is characterized by a low monoclinal structure in the east, high in the west and low in the west. Local development of nasal bulge caused by differential compaction; Chang-9 reservoir formation is delta front subfacies sedimentary, underwater distributary channel is the main genetic type of sand body, reservoir rock type is mainly gray fine-grained feldspar sandstone, and subsurface distributary channel is the main genetic type of sand body. The constructive diagenesis of the reservoir is dissolution and fracture, and the destructive diagenesis is compaction, pressure solution and cementation, which is generally in the middle diagenetic stage A; The reservoir space types are mainly intergranular pore and feldspar solution pore, others are small amount of cuttings solution pore, intergranular solution pore, micro-pore and micro-fracture pore, the pore structure is complex; The average porosity and permeability are 8.90% and 0.46 脳 10 ~ (- 3) 渭 m ~ 2, respectively. The reservoir is a low porosity-ultra low permeability reservoir with strong heterogeneity. Chang-9 reservoir is a typical lithologic reservoir, and its distribution is controlled by source rocks, excess pressure, sedimentary microfacies and diagenesis transformation. The high-quality source rocks developed in the study area provide a good material basis for the formation of Chang-9 reservoir. At the same time, the study area is located in the area of excess pressure and low pressure, which is the favorable direction area for oil and gas migration. The distribution morphology and characteristics of underwater distributary channel sand body, the preservation of primary intergranular pores and the development of secondary pores are the most fundamental factors controlling the accumulation of Chang-9 oil and gas. The main sand body and the high value area of physical property in distributary channel are the main areas of oil and gas accumulation. The sedimentary microfacies, sand body thickness, reservoir physical properties, oil layer thickness and oil test production are used as the parameters for dividing favorable oil and gas zones and the favorable areas are predicted. There are three favorable areas for type 鈪，
本文编号：2440877
[Abstract]:Zengcha block in Wuqi Oilfield is located in the middle of the Yishan slope in Ordos Basin. As the main oil-bearing system in this area, the Triassic Yanchang formation has made a great breakthrough in oil and gas exploration in Chang-9 formation in recent years, but the comprehensive study of petroleum geology is still low. Under the guidance of reservoir geology and the theory of oil and gas accumulation, the characteristics and reservoir control factors of Yanchang-9 reservoir formation are systematically studied by integrating the analysis, test and production data of rock sheet, physical property, mercury pressure and so on. It can provide the basis for the next exploration and deployment of the area. The results show that the Chang-9 formation is divided into three sub-layers: Chang-91, Chang-92 and Chang-93, in which Chang-91 reservoir is the main oil-bearing layer, and the top structure of each layer is characterized by a low monoclinal structure in the east, high in the west and low in the west. Local development of nasal bulge caused by differential compaction; Chang-9 reservoir formation is delta front subfacies sedimentary, underwater distributary channel is the main genetic type of sand body, reservoir rock type is mainly gray fine-grained feldspar sandstone, and subsurface distributary channel is the main genetic type of sand body. The constructive diagenesis of the reservoir is dissolution and fracture, and the destructive diagenesis is compaction, pressure solution and cementation, which is generally in the middle diagenetic stage A; The reservoir space types are mainly intergranular pore and feldspar solution pore, others are small amount of cuttings solution pore, intergranular solution pore, micro-pore and micro-fracture pore, the pore structure is complex; The average porosity and permeability are 8.90% and 0.46 脳 10 ~ (- 3) 渭 m ~ 2, respectively. The reservoir is a low porosity-ultra low permeability reservoir with strong heterogeneity. Chang-9 reservoir is a typical lithologic reservoir, and its distribution is controlled by source rocks, excess pressure, sedimentary microfacies and diagenesis transformation. The high-quality source rocks developed in the study area provide a good material basis for the formation of Chang-9 reservoir. At the same time, the study area is located in the area of excess pressure and low pressure, which is the favorable direction area for oil and gas migration. The distribution morphology and characteristics of underwater distributary channel sand body, the preservation of primary intergranular pores and the development of secondary pores are the most fundamental factors controlling the accumulation of Chang-9 oil and gas. The main sand body and the high value area of physical property in distributary channel are the main areas of oil and gas accumulation. The sedimentary microfacies, sand body thickness, reservoir physical properties, oil layer thickness and oil test production are used as the parameters for dividing favorable oil and gas zones and the favorable areas are predicted. There are three favorable areas for type 鈪，
本文编号：2440877
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