川北地区须四段致密砂岩储层特征及成岩演化

发布时间：2018-03-15 13:04

本文选题：储层特征　切入点：成岩演化　出处：《石油与天然气地质》2017年03期 　论文类型：期刊论文

【摘要】：通过薄片、扫描电镜、压汞及测录井资料分析,结合野外剖面调查和岩心观测等手段,对四川盆地北部须家河组四段致密砂岩储层特征及成岩演化规律进行了研究。结果表明:研究区西部主要发育钙屑砂岩储层,北部主要发育岩屑砂岩储层,东部主要发育长石岩屑砂岩储层,岩石类型的分区性与盆地北部周缘三物源体系分布息息相关;储层物性表现为特低孔、特低渗的特征,孔隙类型以次生溶孔和微裂缝为主,以小孔、细吼为主要特征;储层成岩作用类型复杂,主要有压实压溶作用、胶结作用、溶蚀作用、交代蚀变作用和破裂作用。多种类型的成岩作用在特低渗透致密砂岩储层形成过程中扮演着重要角色。其中,压实作用是造成原生孔隙损失的最主要因素,使储层孔隙度损失77.52%左右;胶结作用破坏储层物性,使孔隙度损失30%左右;溶蚀作用形成次生孔隙,增加孔隙度3.28%;后期构造作用对储层有建设性影响,进而形成现今以次生溶孔-裂缝为主要储集空间的致密砂岩储层。
[Abstract]:Through the analysis of thin slice, scanning electron microscope, mercury injection and logging data, combined with field profile investigation and core observation, The characteristics and diagenetic evolution of tight sandstone reservoirs in the fourth member of Xujiahe formation in northern Sichuan Basin are studied. The results show that the calcareous sandstone reservoirs are mainly developed in the western part of the study area, and the lithic sandstone reservoirs are mainly developed in the northern part of the study area. Feldspar lithic sandstone reservoirs are mainly developed in the east of China. The zoning of rock types is closely related to the distribution of the three source systems around the northern margin of the basin, the physical properties of the reservoirs are characterized by ultra-low porosity and ultra-low permeability, and the pore types are mainly secondary dissolved pores and microfractures. The diagenesis types of reservoirs are complex, including compaction and dissolution, cementation, dissolution, etc. Metasomatic alteration and fracture. Many types of diagenesis play an important role in the formation of ultra-low permeability tight sandstone reservoir. The porosity loss of the reservoir is about 77.52%; the cementation destroys the physical properties of the reservoir and causes the porosity loss of about 30%; the dissolution process forms the secondary pores and increases the porosity 3.28; the late tectonism has a constructive effect on the reservoir. Then the tight sandstone reservoir with secondary solution porosity and fracture as the main reservoir space is formed.
【作者单位】：中国石化江汉油田分公司勘探开发研究院;长江大学非常规油气湖北省协同创新中心;中国石化勘探分公司;中国石油塔里木油田分公司塔中油气开发部;
【基金】：国家科技重大专项(2011ZX05013-006-008)
【分类号】：P618.13

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