利津洼陷沙四上亚段砂岩透镜体成岩作用非均质性成因  

Origin of diagenesis heterogeneity of lenticular sandbodies in the upper Es4,Lijin sag

作　　者：周鸿璞[1,2,3] 黄文辉[1,2,3] 姜在兴[1,2,3] 张元福[1,2,3] 唐鑫萍[4] 董果果[1,2,3] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京100083 [3]中国地质大学(北京)页岩气勘查与评价国土资源部重点实验室,北京100083 [4]中国石油大港油田公司勘探开发研究院,天津300280

出　　处：《东北石油大学学报》2015年第5期52-62,7-8,共11页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05009-002)

摘　　要：以利津洼陷沙四上亚段砂岩透镜体为研究对象,根据显微镜观察、X线衍射、压汞和粒度分析等测试资料,利用反演回剥方法计算压实、胶结和溶解作用对储层的影响;结合原生物性、沉积环境和流体性质研究,探讨成岩作用非均质性成因,建立砂岩透镜体成岩作用非均质性演化模型.结果表明:利津洼陷沙四上亚段的砂岩透镜体可以分为三类:高孔隙带位于砂体中心的Ⅰ型,位于砂体表面的Ⅱ型,以及孔隙分布无明显规律、连通性较差的Ⅲ型.成岩作用非均质性受到沉积物的组成和结构、原始沉积环境和多期流体改造的综合影响.沉积物的组成和结构影响压实作用和流体活动性,并不是绝对控制因素;原始沉积环境影响早期碳酸盐胶结,作为保持性成岩作用,具有更显著的抵抗压实作用,为后期溶蚀作用提供可溶空间,是Ⅰ、Ⅱ型和Ⅲ型砂体的差异演化基础;经过叠加多期流体改造,产生不同的孔隙展布特征,是导致成岩作用非均质性的直接原因.Ⅰ型砂体为最有利储层,Ⅱ型砂体为较有利储层,Ⅲ型砂体不利于油气的保存和开采.To analyze the origin of diagenesis heterogeneity in different lenticular sandbodies,samples in Lijin sag are tested by cathodoluminescence microscope,X-ray diffraction,mercury injection and grainsize analysis,comparing the grain size,sorting coefficient.The effect of compaction,cement and dissolution are calculated by back-stripping method.Then the origin of diagenesis heterogeneity are illustrated combining with the primary physical properties,depositional environment and fluid properties and an evolution model of diagenesis heterogeneity is built.The result shows that there are three types of sandbodies with different high porosity zone.TypeⅠ with high porosity is in the center of the sand body;type Ⅱ with high porosity is located at the edge of the sand body and typeⅢ with high porosity dispersed distributes in the fan delta.The heterogeneity is affected by the composition and structure of sediments,paleoenvironment and the multi-stage fluids.The composition and structure of sediments are not the dominant factor,which could be faded by other factors,although they can affect slightly the compaction and fluid flowing.And the paleoenvironment has a close relation with the content of carbonate which can inhibit the compaction and preserve space for secondary pores.Then multi-stage fluids produce secondary pores from the surface of sandbodies to the center,which is the directly reason of the diagenesis heterogeneity.It shows that the typeⅠis the most favorite reservoir,typeⅡis favorite reservoir and typeⅢis not beneficial to the preservation and production of oil.

关 键 词：砂岩透镜体 沉积环境 成岩作用 碳酸盐胶结物 利津洼陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]