琼东南盆地崖城区微观构造变形特征及油气地质意义  

Characterization of micro-structural deformation and its petroleum significance in Yacheng area of Qiongdongnan Basin

作　　者：裴仰文 王静 范彩伟[3] 吴孔友 张泽宇 PEI Yangwen;WANG Jing;FAN Caiwei;WU Kongyou;ZHANG Zeyu(State Key Laboratory of Deep Oil and Gas,Qingdao 266580,China;School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China;Zhanjiang/Hainan Branch of CNOOC Limited,Haikou 570300,China)

机构地区：[1]深层油气全国重点实验室,山东青岛266580 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]中海石油(中国)湛江/海南分公司,海南海口570300

出　　处：《中国石油大学学报（自然科学版）》2023年第3期15-26,共12页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金面上项目(42272147,41872143);山东省泰山学者青年专家项目(tsqn202211081)。

摘　　要：在琼东南盆地中深层地层中,圈闭边界形成、储层流体空间分布、岩石强度变化等要素,不仅与沉积单元、岩石组分相关,还与微观构造变形有一定的关系。通过岩心和镜下观测对琼东南盆地崖城区微观构造的发育特征进行研究,分析岩石组分与微观构造类型之间的关系,探讨不同类型微观构造变形的形成机制,并通过孔隙度、渗透率测试定量评价微观构造的发育对研究区储层物性的改造作用。研究表明:研究区发育微裂缝、碎裂带、微观涂抹带和硅酸盐混合变形带4种微观构造类型;变形带内黏土矿物含量是发育微观变形类型的主要控制因素,黏土矿物体积分数小于20%时主要发育碎裂带,黏土矿物体积分数大于50%时主要发育微观涂抹带,黏土矿物体积分数介于20%~50%之间时主要发育硅酸盐混合变形带;微观构造的发育对研究区储层物性具有一定的影响,其中微裂缝的发育能够有效提高原岩孔隙度和渗透率,而微观变形带的发育对储层物性的改造作用较为有限。In moderate-to deep strata of the Qiongdongnan Basin,the formation of trap boundaries,the spatial distribution of reservoir fluids,and the variation of rock strength are not only related to sedimentary units and rock components,but also highly affected by micro-structural deformation.In this research,sampling and micro-scale observation to research the characteristic of micro-structures was firstly identified by core samples observation and micro-scale observation.We then analyzed the relationship between rock components and micro-structure classification and discussed the formation mechanism of different types of micro-structures.The impact of micro-structural deformation on the properties of reservoir rocks were then revealed based on porosity and permeability tests and analyses.This study identified four different types of micro-structures in the Yacheng area,which were micro-cleavages,cataclastic deformation bands,micro-phyllosilicate smearing bands,and phyllosilicate framework deformation bands.The clay mineral content was identified as the primary controlling factor for the development of micro-structures.Cataclastic deformation bands were normally developed with clay content of lower than 20%,whereas micro-phyllosilicate smearing bands were likely developed with clay content of higher than 50%.Phyllosilicate framework deformation bands were potentially developed with clay content of 20%-50%.This study also revealed that the development of micro-cleavages could effectively improve the porosity and permeability of reservoir rocks,while the development of micro-deformation bands presented limited influences on the properties of reservoir rocks.These findings have important implications for the exploration and exploitation of oil and gas resources in the Qiongdongnan Basin,as they highlight the significance of micro-structural deformation on the potential properties of fluid flows.

关 键 词：琼东南盆地 微裂缝 微观变形带 储层物性 

分 类 号：TE121[石油与天然气工程—油气勘探]