摘要
近年来川西北、川中二叠系栖霞组油气勘探获得一系列突破,揭示了栖霞组广阔的勘探潜力。基于近几年的钻井、野外露头、测井、地震及微区多参数实验分析数据等资料,对四川盆地栖霞组沉积储层的关键地质问题开展了系统分析。研究认为:①栖霞组沉积受到川中古隆起残余地貌控制,其中古隆起大部分地区发育浅缓坡,古隆起东缘呈“S”形,向东南方向逐渐演化为中—深缓坡,古隆起西缘地貌最高,是台缘带发育的基础。②川西地区栖霞中晚期发育右倾的“L”形弱镶边台缘带,向东北延伸至广元地区,向西南延伸至峨眉山地区;台缘带向西突变为广海,向东则渐变为碳酸盐缓坡。③晶粒白云岩是栖霞组最主要的储集岩,是在准同生期富镁流体渗透回流作用下逐渐形成的,经历埋藏环境调整改造后定型。④优质白云岩储层受沉积相带、层序界面、微古地貌等因素控制,其中厚层晶粒白云岩主要分布在川西广元—江油以及雅安—峨眉山一带,中—薄层晶粒白云岩主要分布在川中南充—磨溪—高石梯一带。
Based on the data of drilling,outcrop,logging,seismic and micro-area multi-parameter experimental analysis obtained in recent years,the key geological problems of the Permian Qixia Formation in sichuan basin are systematically analyzed and the following recognitions is obtained:(1)The sedimentation of Qixia Formation is controlled by the residual geomorphology of Middle Sichuan paleouplift,in which the shallow ramp is developed in most areas of paleouplift.The eastern margin of the paleouplift appears as a shape of“S”,and gradually evolves into a medium-deep ramp towards the southeast.The geomorphology of the western margin of the paleouplift is relatively the highest,which is the basis for the development of the platform margin.(2)In the middle-late Qixia period,there exists a right-leaning“L”type slightly rimmed platform margin in western Sichuan,which extends to Guangyuan area in northeast and Emeishan area in southwest.The platform margin transforms into a broad sea sharply in the west and a carbonate ramp gradually in the east.(3)As the main reservoir rock of Qixia Formation,crystalline dolomite is formed gradually under the penecontemporaneous magnesium-rich fluid infiltration and reflux,and is finalized after adjustment and transformation in a buried environment.(4)High quality dolomite reservoirs are controlled by sedimentary facies,sequence interfaces,micro-paleogeomorphology and other factors,among which the thick crystalline dolomite layers are mainly distributed in the Guangyuan-Jiangyou and Ya’an-Leshan areas in western Sichuan Basin,and the medium-thin crystalline dolomite layers are mainly distributed in the Nanchong-Moxi-Gaoshiti areas in central Sichuan Basin.
作者
郝毅
谷明峰
韦东晓
潘立银
吕玉珍
HAO Yi;GU Mingfeng;WEI Dongxiao;PAN Liyin;LüYuzhen(不详;PetroChina Hangzhou Research Institute of Geology,,Zhejiang 310023,China)
出处
《海相油气地质》
CSCD
北大核心
2020年第3期193-201,共9页
Marine Origin Petroleum Geology
基金
国家科技重大专项下属课题“深层古老含油气系统成藏规律与目标评价”(编号:2017ZX05008-005)
中国石油重大科技项目下属课题“深层油气储层形成机理与分布规律”(编号:2018A-0103)
“深层-超深层油气富集规律与区带目标评价”(编号:2018A-0105)
中国石油天然气股份有限公司直属院所基础研究和战略储备技术研究基金“古老海相碳酸盐岩定年、定温与微量-稀土元素面扫描技术研发及应用”(编号:2018D-5008-03)共同资助。
关键词
古地理
沉积相
储层成因
储层分布
栖霞组
二叠系
四川盆地
palaeogeography
sedimentary facies
genesis of reservoirs
distribution of reservoirs
Qixia Formation
Permian
Sichuan Basin
