摘要
鄂尔多斯盆地中西部麻黄山—堡子湾地区三叠系长1+2油藏普遍发育低渗透砂岩储层,油气勘探潜力巨大,但成藏条件及主控因素尚未明确。为此,基于岩心、铸体薄片及测井等资料,开展成藏条件、油藏富集主控因素分析。结果表明:研究区长1+2油藏油源来自于长7段深湖相泥页岩,油气通过断层、多期叠置砂体运移;不整合面、低幅鼻隆构造、优势相带和物性是控制长1+2油藏富集的关键因素;在不整合面和低幅鼻隆构造封挡作用下,油藏不断向东南方向迁移,在优势相带及物性好的区域油气最为富集,具有“不整合面遮挡、砂体断层疏导、鼻隆控藏、物性控富”的成藏特征。研究成果为该地区低渗透油藏预测提供了理论依据。
Low-permeability sandstone reservoirs in the Triassic Chang 1+2 oil reservoirs are widely developed in the Mahuangshan-Buziwan area in the central and western Ordos Basin,with great potential for hydrocarbon exploration.However,the hydrocarbon accumulation conditions and main controlling factors remain unclear.To address this,an analysis of hydrocarbon accumulation conditions and the main controlling factors of oil reservoir enrichment was conducted based on core samples,cast thin sections,and logging data.The results show that The oil source for the Chang 1+2 reservoirs in the study area is the Chang 7 deep-lacustrine mud-shale.Hydrocarbons migrate through faults and multi-phase superimposed sand bodies.Unconformities,low-amplitude nose structures,dominant facies belts,and lithological properties are the key factors controlling the enrichment of the Chang 1+2 reservoirs.Under the blocking effect of unconformities and low-amplitude nose structures,the reservoirs continue to migrate towards the southeast,with the richest hydrocarbons in areas with dominant facies belt and lithological properties.The reservoirs have the characteristics of"unconformity blocking,sandbody-fault guidance,nose-controlled reservoirs,and lithological control of enrichment".The research provides a theoretical basis for predicting low-permeability reservoirs in the area.
作者
张靓
齐媛
孙玉玺
贺燚平
ZHANG Liang;QI Yuan;SUN Yuxi;HE Yiping(Sinopec Research Institute of Petroleum Engineering Co.,Ltd.,Beijing 102206,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 102206,China;China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710021,China)
出处
《特种油气藏》
北大核心
2025年第4期68-76,共9页
Special Oil & Gas Reservoirs
基金
中国石油创新基金“吉木萨尔凹陷芦草沟组碳酸盐岩滩坝型储层成因与分布”(2021D002-0102)。
关键词
鄂尔多斯盆地
延长组
不整合面
成藏因素
油藏分布
Ordos Basin
Yanchang Formation
unconformity
accumulation factors
reservoir distribution
