摘要
准西车排子地区石炭系是油气勘探重点层位。在单井岩心观察、样品测试和测井响应分析的基础上,分析不整合界面上下的岩矿、裂缝、地球化学及物性特征,划分出单井不整合结构。统计分析认为,早期沉积间断造成的风化作用对不整合风化壳的分布有重要控制作用,可通过岩心特征结合地球物理测井数据分析预测不整合面结构顶板的发育展布特征。且不整合结构的分布对于油气成藏具有一定的控制作用,石炭系原油均属于顶板砂岩侧向输导、风化壳顶部水解层封盖、淋滤层有效储集的方式聚集成藏,在断块作用下形成相对独立的油水系统,形成一系列的断块型油藏。由此建立了石炭系顶不整合结构风化壳展布特征的识别方法,其与油气成藏的关系可为类似地区石炭系油气勘探提供地质依据。
The Carboniferous system in Chepaizi area,western Junggar Basin,is the key horizon for oil and gas exploration.On the basis of single well core observation,sample test and well logging response analysis,the rock and mineral,fracture,geochemical and physical characteristics above and below the unconformity interface are analyzed,and the unconformity structure of single well is divided.Statistical analysis shows that the weathering caused by the early depositional discontinuity plays an important role in controlling the distribution of unconformity weathering crust,which can be divided by core characteristics and geophysical logging data.The development and distribution characteristics of unconformity roof are analyzed and predicted.The distribution of unconformity structure has a certain controlling effect on oil and gas accumulation.Carboniferous crude oil belongs to lateral conduction of roof sandstone,capping of hydrolytic layer at the top of weathering crust and effective reservoir formation of leachate layer,which forms relatively independent oilwater system and forms a series of fault block reservoirs.The identification method of weathering crust distribution characteristics of unconformity structure at the top of Carboniferous system and its relationship with hydrocarbon accumulation can provide geological basis for hydrocarbon exploration of Carboniferous system in similar areas.
作者
曾治平
刘显凤
Zeng Zhiping;Liu Xianfeng(Research Institute of Exploration and Development,Shengli Oilfield Company,Sinopec,Dongying,Shandong,257000,China;School of Geosciences,Yangtze University,Wuhan,Hubei,430100,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第1期61-65,共5页
Xinjiang Geology
基金
国家科学自然基金(41772146)。
关键词
车排子地区
不整合结构
风化作用
发育展布
油气成藏
Chepaizi Area
Unconformity structure
Weathering
Development and distribution
Hydrocarbon accumulation
