鄂尔多斯盆地正宁地区长8油层组储层特征

发布时间：2019-02-12 21:39

【摘要】：为推进鄂尔多斯盆地正宁地区致密油气的勘探开发,基于长8油层组岩心薄片、扫描电镜及压汞资料,分析了储层发育特征、储层致密化的原因及物性与含油性的关系。结果表明,长8油层组岩性以岩屑长石砂岩和长石岩屑砂岩为主,填隙物含量较高,碎屑颗粒结构成熟度低。储层孔隙包括基质孔隙和裂缝两大类,基质孔隙主要发育粒间孔和长石溶孔,裂缝主要发育构造裂缝和成岩微裂缝。基质孔隙以小孔、细喉为主。压实作用和胶结作用均是储层致密的主要原因,天然裂缝是油气重要的渗流通道,溶蚀作用和天然裂缝均改善了储层物性。物性分布与砂体分布具有较好的一致性,长81小层物性明显优于长82小层。良好的物性是油井高产的关键因素。
[Abstract]:In order to promote the exploration and development of dense oil and gas in Zhengning area, Ordos Basin, based on the core thin slice, scanning electron microscope and mercury injection data of Chang 8 oil formation, the characteristics of reservoir development, the reason of reservoir densification and the relationship between physical properties and oil content are analyzed. The results show that the lithology of Chang 8 formation is dominated by lithic feldspathic sandstone and feldspathic lithic sandstone with high content of interstitial material and low maturity of clastic grain structure. Reservoir pores include matrix pores and fractures. Intergranular pores and feldspar dissolution pores are mainly developed in matrix pores and tectonic fractures and diagenetic microfractures are mainly developed in fractures. The matrix pore is small pore, fine larynx is main. Compaction and cementation are the main reasons for reservoir compactness. Natural fractures are important seepage channels for oil and gas. Both dissolution and natural fractures improve reservoir physical properties. The distribution of physical properties is consistent with that of sand bodies, and the physical properties of Chang 81 layer are obviously better than those of Chang 82 layer. Good physical property is the key factor for high production of oil well.
【作者单位】：西南石油大学地球科学与技术学院;中国石油长庆油田分公司勘探开发研究院;
【基金】：国家自然科学基金“泥质岩层对低渗透砂岩储层油气成藏的控制机理研究”(编号:41502146) 国家重点基础研究发展(973计划)项目“致密油(页岩油)赋存与运聚机理”(编号:2014CB239005) 中国石油科技创新基金项目“源储间的薄层泥岩对致密砂岩储层含油性的控制机理研究”(编号:2015D-5006-0101)联合资助
【分类号】：P618.13

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