临河坳陷变质岩潜山储层形成控制因素及特征  

Reservoir Characteristics and Control Factors of Metamorphic Buried Hill in Linhe Depression

作　　者：胡晨光 潘勇利 周鑫宇 陈洪芝 黄强基 梁骏 薛辉 HU Chenguang;PAN Yongli;ZHOU Xinyu;CHEN Hongzhi;HUANG Qiangji;LIANG Jun;XUE Hui(Research Institute of Petroleum Exploration and Development,PetroChina Huabei Oilfield Company,Renqiu,Hebei 062552,China)

机构地区：[1]中国石油华北油田分公司勘探开发研究院,河北任丘062552

出　　处：《西安石油大学学报（自然科学版）》2023年第4期20-29,共10页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中国石油天然气股份有限公司重大科技项目“华北油田持续有效稳产勘探开发关键技术研究与应用”(2017E-15)。

摘　　要：针对临河坳陷变质岩潜山优质储层特征不清、形成控制因素不明等问题,综合利用岩心、薄片、测录井和分析化验等资料,开展潜山储层岩性、储集空间、孔喉结构、物性等特征研究,探讨优质储层形成的控制因素。结果表明:研究区主要发育片麻岩、斜长角闪岩、碎裂岩、糜棱岩、混合片麻岩和混合花岗岩6种变质岩;发育孔隙、裂缝2类储集空间和中孔细喉型、小孔细-微喉型、微孔微喉型3类孔喉结构;主要发育低孔低渗型储层,储层纵向差异性分布。进一步分析认为:变质岩中浅色矿物体积分数越高,岩石结构越均一,裂缝发育程度越高,优质储层就越发育;岩溶作用在潜山顶面和裂缝发育区形成大量溶蚀孔缝,是优质储层形成的关键;构造运动控制断裂及裂缝的形成,同时构造抬升使埋藏变浅,有助于溶蚀作用的发生和优质储集空间的保存;研究区变质岩潜山优质储层发育具有“纵向顶面富集,横向高点有利”的特点。In order to understand the characteristics and control factors of high-quality metamorphic rock buried hill reservoir in Linhe Depression,the lithology,reservoir space,pore throat structure,physical properties of the buried hill reservoir were studied by comprehensive use of core,thin section,logging and analysis and laboratory data.The results show that the metamorphic rock can be divided into six categories,the lithologies of the metamorphic rock were dominated by gneiss,amphibolite,cataclasite,mylonite,migmatitic gneiss,migmatitic granite.The storage space can be divided into 2 types(pores,fractures),and there are three types of pore throat structure:medium pore with fine throat,small pore with fine-micro throat,micro-pores with micro-throat.The overall physical property of the reservoir is characterized by low porosity and low permeability,and the distribution of the reservoir is quite various in the vertical direction.Further analysis indicates that the higher the volume fraction of light-colored mineral in metamorphic rocks,the more uniform the rock texture,the higher the fracture development level,the more developed the high-quality reservoir.The Karstification resulted in a large number of dissolution pores(fractures)on the top part of buried hill and in fracture development zone,which is the key to the formation of high-quality reservoir.Tectonic movement controls the generation of the faults and fractures,and at the same time,structure uplifting makes the burial depth decreased,which is conducive to the occurrence of dissolution and the preservation of high-quality storage space.The high-quality reservoir is enriched on the top of burial hill in vertical direction,and high points are favorable zone in horizontal direction in the study area.

关 键 词：变质岩 潜山 储层特征 控制因素 临河坳陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]