泾河油田走滑断裂带长8-长6段致密砂岩构造成岩作用及控储分析  

Structural diagenesis and reservoir control analysis of tight sandstone in the strike-slip fault zones of the Chang 8 to Chang 6 Members in the Jinghe Oilfield

作　　者：孟玉净 骆杨 赵彦超[1] 陈红汉[1] 平宏伟[1] 房晓军 MENG Yujing;LUO Yang;ZHAO Yanchao;CHEN Honghan;PING Hongwei;FANG Xiaojun(School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;SINOPEC North China Oil and Gas Branch,Zhengzhou 450006,China)

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074 [2]中国石化华北油气分公司,郑州450006

出　　处：《地质科技通报》2025年第1期74-89,共16页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(42072176);中国石油化工股份有限公司科技项目(P21026)。

摘　　要：泾河油田长8-长6段致密砂岩“甜点”储层受走滑断裂带及内部结构模式控制,且分布非均质性极强,表明构造成岩作用是主要控制因素。综合多种资料,开展了断裂带构造成岩成储分析,为致密砂岩油藏高效开发提供了依据。研究表明:受构造应力应变差异控制,走滑断裂带与走滑断裂带之间区域的构造成岩作用及控储特征存在差异,主要表现在:(1)走滑断裂带的构造应力应变具有簇状分布特点。走滑断裂带为高应力应变区(HSSZ),走滑断裂带之间的区域为低应力应变区(LSSZ)。走滑断裂带沿走向可划分为张扭段、压扭段和走滑段;垂直于断层走向可概括出三大类八小类侧向分带结构模式。(2)走滑断裂带的构造成岩作用包括:变形条带、胶结作用、溶蚀及交代作用、微裂缝、碎裂作用、构造涂抹。(3)构造应力应变差异控制了构造成岩差异,进而控制了储层物性:①HSSZ区域和LSSZ区域的压实减孔作用均强于胶结作用。但是HSSZ区域的构造成岩减孔作用强于LSSZ区域,而LSSZ区域的胶结减孔作用强于HSSZ区域。②分段控储作用由好到差依次为:张扭段、断层端部、弱张扭段、走滑段、压扭段。[Objective]The distribution of tight sandstone sweet spots in the Chang 8 to Chang 6 members of the Jinghe Oilfield is primarily influenced by strike-slip fault zones and their internal structural patterns,which demonstrate significant heterogeneity.This finding indicates that tectonic diagenesis is the main controlling factor of reservoir heterogeneity.[Methods]This paper integrates various datasets to analyze structural diagenesis and reservoir formation within fault zones,thereby providing a foundation for the efficient development of tight sandstone reservoirs.[Results and Conclusions]Variations in structural stress and strain lead to differing structural diagenesis and reservoir characteristics between and within strike-slip fault zones.The key findings include the following:(1)The structural stress and strain in strike-slip fault zones show clustered distribution characteristics.The zones are categorized into high-stress–strain zones(HSSZs)and low-stress–strain zones(LSSZs).Additionally,within strike-slip faults,transtensional,transpressional,and strike-slip segments can be distinguished along the fault strike,while three major categories and eight secondary categories of lateral zoning structural patterns are summarized along the fault dip.(2)Structural diagenesis within strike-slip fault zones includes deformation bands,cementation,dissolution and replacement,microfracturing,cataclasis,and smearing.(3)The differences in structural stress and strain govern the variations in structural diagenesis and,consequently,reservoir physical properties:(a)Both the HSSZ and LSSZ experienced more significant compaction and porosity reduction compared to cementation.However,the porosity reduction caused by structural diagenesis in the HSSZ was more intense than that in the LSSZ,whereas cementation in the HSSZ was greater than that in the LSSZ.(b)Under the influence of structural diagenesis,the physical properties of different segments decrease in the following sequence:transtensional segments,fault tips,weak transte

关 键 词：构造成岩作用 致密砂岩 构造控储效应 走滑断裂带 泾河油田 

分 类 号：P618.130.21[天文地球—矿床学]