异常高压下海相重力流致密砂岩非均质性特征及其影响因素——以莺歌海盆地LD10区中新统黄流组储集层为例  

Heterogeneity and influencing factors of marine gravity flow tight sandstone under abnormally high pressure: A case study from the Miocene Huangliu Formation reservoirs in LD10 area, Yinggehai Basin, South China Sea

作　　者：范彩伟 曹江骏 罗静兰[2] 李珊珊 吴仕玖 代龙 侯静娴 毛倩茹 FAN Caiwei;CAO Jiangjun;LUO Jinglan;LI Shanshan;WU Shijiu;DAI Long;HOU Jingxian;MAO Qianru(Zhanjiang Branch of CNOOC Ltd,Zhanjiang 524057,China;Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]西北大学地质学系/大陆动力学国家重点实验室,西安710069

出　　处：《石油勘探与开发》2021年第5期903-915,949,共14页Petroleum Exploration and Development

基　　金：“南海西部高温高压气藏勘探开发技术及勘探新领域研究”(CNOOC-KJ135ZDXM38ZJ02ZJ);国家自然科学基金面上项目(41972129);国家科技重大专项课题(2016ZX05024-005,2016ZX05026-003-005)。

摘　　要：通过模块式地层动态检测、铸体薄片、黏土矿物X射线衍射、扫描电镜、高压压汞、埋藏热史等分析,对莺歌海盆地LD10异常高压区中新统黄流组海相重力流致密砂岩储集层非均质性特征及其演化过程进行研究,探讨储集层非均质性的影响因素,预测有利储集层分布。结果表明,(1)储集层非均质性主要由胶结物非均质性、孔喉非均质性及物性非均质性决定,并受异常高压影响下的成岩作用控制;(2)成岩演化过程导致的孔喉结构差异影响了胶结物及孔喉非均质性,进而控制了储集层的物性非均质性;(3)与常压储集层相比,异常高压抑制了压实作用与胶结作用的强度、增强了溶蚀作用,在一定程度上使储集层的非均质性变弱。有利储集层主要分布在黄流组中下部强超压带的重力流水道砂体中。图8表3参38.The characteristics of reservoir heterogeneity of the marine gravity flow tight sandstone from the Miocene Huangliu Formation under abnormally high pressure setting at LD10 area in Yinggehai Basin are studied, and the influencing factors on reservoir heterogeneity are discussed, based on modular formation dynamics tester, thin sections, XRD analysis of clay minerals, scanning electron microscopy, measurement of pore throat image, porosity and permeability, and high pressure Hg injection, as well as the stimulation of burial thermal history. The aim is to elucidate characteristics of the heterogeneity and the evolution process of heterogeneity of the reservoir, and predict the favorable reservoirs distribution.(1) The heterogeneity of the reservoir is mainly controlled by the cement heterogeneity, pore throat heterogeneity, quality of the reservoir heterogeneity, and the diagenesis under an abnormally high pressure setting.(2) The differences in pore-throat structure caused by diagenetic evolution affected the intergranular material heterogeneity and the pore throat heterogeneity, and finally controlled the heterogeneity of reservoir quality.(3) Compared with the reservoir under normal pressure, abnormally high pressure restrains strength of the compaction and cementation and enhances the dissolution of the reservoir to some extent, and abnormally high pressure thus weakening the heterogeneity of the reservoir to a certain degree. The favorable reservoirs are mainly distributed in the gravity flow sand body under the strong overpressure zone in the middle and lower part of Huangliu Formation.

关 键 词：异常高压 成岩演化 储集层非均质性 海相重力流 致密砂岩 中新统黄流组 莺歌海盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]