| 本文已被：浏览次 下载次 |
码上扫一扫！ |
|
|
| 鄂尔多斯盆地姬塬地区延长组碎屑岩储层 低渗一特征及含油性主控因素 |
|
高剑波1,庞雄奇1,2,王志欣1,2,姜振学1,2,丁保来1,2,席胜利3
|
|
(1.中国石油大学教育部石油与天然气成藏机理重点实验室，北京102249;2.中国石油大学盆地与油藏研究中心，北京102249 ;3.长庆油田勘探开发研究院，陕西西安710021)
|
|
| 摘要: |
| 鄂尔多斯盆地上三叠统延长组发育陆相坳陷型湖泊三角洲相低渗储层。在岩石薄片、铸体薄片、扫描电镜、X 光衍射、自生伊利石K-Ar同位素测年等分析的基础上,对该地区延长组长6—长2段低渗致密储集砂体的岩石学 特征、孔隙类型、物性特征、成岩动力学及孔隙演化特征进行了研究,并对低渗透储层的含油气性进行了分析。结果 表明:①该组砂体以长石砂岩为主，次为岩屑砂岩和长石质岩肩砂岩，矿物成熟度低;②孔隙类型包括残余粒间孔、 晶间孔、溶蚀孔和微裂缝,其中残余粒间孔是储层的主要储集空间;③主要成岩作用包括机械压实作用、溶蚀作用、 碳酸盐胶结作用、自生粘土矿物胶结作用等,其中溶蚀作用产生的次生孔隙对储层物性的改善不足;④成岩作用开 始较早、塑性岩屑颗粒大量变形、压实作用强烈是导致早期砂岩孔隙丧失的根本原因，碳酸盐岩胶结作用、次生孔隙 不发育是造成后期储层岩石致密的主要因素。含油气性分析结果表明,砂体的不同沉积成因类型是层间含油气性 差异的主控因素；同一成因砂体内部的非均质性是层内含油气性差异的主控因素。 |
| 关键词: 鄂尔多斯盆地 延长组 碎屑岩 低渗透储层 含油性 主控因素 |
| DOI： |
| 分类号: |
| 基金项目:国家“973”重点基础研究项目(G〗9990433 ； 2006CB 202308) |
|
| Characteristics and master control factors of petroliferous properties of low permeability clastic reservoirs of Yan-chang formation in the upper Triassic of Jiyuan area in Ordos Basin |
|
GAO Jian-bo1,PANG Xiong-qi1,2,WANG Zhi-xin1,2,JIANG Zhen-xue1,2,DING Bao-lai1,2,XI Sheng-li3
|
|
(1. Key Laboratory for Hydrocarbon Accumulation Mechanism of Education of Ministry f China University of Petroleum,Beijing 102249,China;2. Basin & Reservoir Research Center，China University of Petroleum, Beijing 102249, China;3. Research Institute of Exploration and Development of Chongqing Oilfield , Xi,an 710021, China )
|
| Abstract: |
| Reservoirs in Yan-chang formation in the upper Triassic in Ordos Basin are low permeability clastic rocks of depression with delta and lacustrine facies. Petrologic characteristics，pore types, physical properties, diagenetic dynamics and pores evolution were researched by observing under microscope, cathode luminescence, scanning electron microprobe, X-ray diffraction ( XRD) and illite K-Ar dating technique. The conclusions are the following:① The reservoir-rock types in Yan-chang formation are mainly arkose, secondly litharenite and lithic arkose in low compositional maturity.②The pore spaces are completely dominated by primary pore, including intergranular pore, intercrystalline pore, dissolved pore and micro-frac-ture,③The diageneses mainly comprise compaction，dissolution, cementation of carbonate and autogenetic clay mineral, the secondary porosity caused by dissolution is unfavorable for the improvement of the physical properties.④The early loss of the porosity results from the fast diagenesis, the deformation of a lot of plastic lithic fragment, strong compaction and the late loss |
| Key words: Ordos Basin Yan-chang formation clastic rock low permeability reservoirs petroliferous properties master control factors |
