摘要
准噶尔盆地是中国西部典型的含油气叠合盆地,其陆梁隆起滴南凸起经过多年的持续勘探已发现储量达千亿立方米的克拉美丽气田、滴水泉油田、滴西12井油藏、滴西121井气藏4个高效油气田(藏),主要含油气层位为石炭系、二叠系、侏罗系八道湾组和头屯河组、白垩系呼图壁河组,显示出多层系的油气富集特征。滴南凸起以往由于石炭系气藏的规模较大,其石炭系火山岩多受关注,二叠系、侏罗系和白垩系的油气相关研究较少,更缺乏从多层系的角度开展整体宏观、系统的油气富集特征分析。通过对滴南凸起的沉积、构造、储层、烃源岩、油气特征和成藏模式进行多方面系统总结,分析了滴南凸起多层系的油气富集条件,形成以下认识:(1)滴南凸起及其周缘发育石炭系煤系和二叠系湖相两套烃源岩,其中,石炭系烃源岩油、气兼生,是滴南凸起内天然气藏和石炭系油藏的油气来源,二叠系烃源岩以生油为主,是侏罗系和白垩系油藏原油的主要来源;(2)滴南凸起在石炭系内、石炭系-二叠系、三叠系、侏罗系和白垩系中发育多套储-盖组合,其中,储层以火山岩、砂砾岩、砂岩为主,盖层多为区域厚层泥岩盖层;(3)滴南凸起的石炭系气藏受烃源岩、断裂、构造和有利火山岩相带控制,油气沿石炭系的不整合面运移成藏,且在受断裂改造、调整后于浅层三叠系、侏罗系和白垩系的构造、岩性圈闭中形成次生油气藏。滴南凸起多层系含油气的特征表明其具有立体勘探前景,是准噶尔盆地寻求油气规模、高效发现的现实领域。
Junggar Basin is a typical superimposed petroliferous basin in western China.After years of continuous exploration,four efficient oil and gas fields(reservoirs)have been discovered in Dinan salient of the Luliang uplift,including Kelameili gas field,Dishuiquan oilfield,Well Dixi12 oil reservoir,and Well Dixi121 gas reservoir,with the total reserves of 100 billion cubic meters.The main hydrocarbon-bearing horizons are Carboniferous System,Permian System,Jurassic Badaowan and Toutunhe formations,and Cretaceous Hutubihe Formation,showing the characteristics of oil and gas enrichment in multi-layer system.In the past,due to the large scale of Carboniferous gas reservoirs,the Carboniferous volcanic rocks of Dinan salient attracted much attention.By contrast,there were few studies related to oil and gas in Permian System,Jurassic System,and Cretaceous System,and there lacked an overall,macroscopic and systematic analysis of oil and gas enrichment characteristics from the perspective of multilayer system.By comprehensively and systematically summarizing the sedimentary,tectonic,reservoir,source rock,and hydrocarbon characteristics as well as hydrocarbon accumulation models of Dinan salient,the paper analyzes the hydrocarbon enrichment conditions of multilayer system in Dinan salient,and obtains the following conclusions.(1)Carboniferous coal-bearing and Permian lacustrine source rocks are developed in Dinan salient and its surrounding areas.Among them,Carboniferous source rocks generate both oil and gas,which are the source of natural gas reservoirs and Carboniferous oil reservoirs in Dinan salient;Permian source rocks mainly generate oil,which are the main crude oil source of Jurassic and Cretaceous reservoirs.(2)Dinan salient develops multiple sets of reservoir-cap assemblages in Carboniferous System,Permian System,Triassic System,Jurassic System,and Cretaceous System,among which the reservoirs are dominated by volcanic rocks,glutenites and sandstones and the regional thick mudstone caps are mostly seen.(3)The Carboniferous gas reservoirs in Dinan salient are controlled by source rocks,faults,tectonics,and favorable volcanic facies zones.Oil and gas migrate along the Carboniferous unconformity,and then form secondary oil and gas reservoirs after being transformed and adjusted by faults in the shallow Triassic,Jurassic and Cretaceous structural and lithologic targets The hydrocarbon-bearing characteristics of the multilayer system in Dinan salient indicate that it has a stereoscopic exploration prospect,which is a realistic field to seek large-scale and efficient discovery of oil and gas resources in Junggar Basin.
作者
李艳平
汪洋
向英杰
谢俊阳
李雷
姚华
屈伟
付基友
Li Yanping;Wang Yang;Xiang Yingjie;Xie Junyang;Li Lei;Yao Hua;Qu Wei;Fu Jiyou(Research Institute of Exploration and Development,PetroChina XinJiang Oilfield Company,Xinjiang Urumqi 830013,China;Exploration Division,PetroChina XinJiang Oilfield Company,Xinjiang Karamay 834000,China;Geological Research Institute,CNPC Xibu Drilling Engineering Company,Xinjiang Karamay 834000,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2023年第5期778-793,共16页
Acta Petrolei Sinica
基金
中国石油天然气股份有限公司“十四五”前瞻性基础性科技重大项目(2021DJ0206)资助。
关键词
滴南凸起
多层系
石油地质特征
富集条件
成藏模式
Dinan salient
multilayer system
petroleum geological characteristics
enrichment condition
accumulation model