中扬子区海相层系石油地质特征与勘探方向选择  

Petroleum Geologic Characteristics and Exploration Direction Selection on Marine Series in Middle Yangtze Region

作　　者：郭战峰[1] 盛贤才[1] 胡晓凤[1] 刘莉[1] 文可东[1] 

机构地区：[1]中石化江汉油田分公司勘探开发研究院,湖北武汉430223

出　　处：《石油天然气学报》2013年第6期1-9,共9页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2011ZX05005-003-004)

摘　　要：中扬子地区一些新的勘探投入以及进展使得对其勘探领域需要重新认识和评价。基于盆地形成与沉积充填、分析测试、钻井等最新资料,进一步证实了中扬子地区发育4套主要烃源岩、5套储层以及4套重要盖层,但区域差异性极强;加里东-印支期研究区构造改造微弱,生成的油气聚集于中扬子北缘隆起带以及斜坡部位形成岩性或地层-岩性油气藏;早燕山期构造改造强烈,弱构造改造区油气藏调整运移后保存几率较大,南北推覆体下盘原地体亦具有较好的成藏地质条件;晚燕山期深埋作用有利于演化程度较低的烃源岩二次生烃以及残存古油藏热解生气与晚期成藏。现今弱构造改造区的调整型油气藏、白垩纪-古近纪深埋区二次生烃型(残存古油藏热解)油气藏、上古生界地层-岩性油气藏、造山带周缘推覆型油气藏以及寒武系、志留系等层系的页岩气是值得探索的勘探领域。It was needed to re-recognize and evaluate oil exploration areas because of the new investment on oil exploration and progress in the middle Yangtze area.Based on a series of the latest data of basin formation and sedimentary filling,analysis and test,as well as drilling,it was further proved that there developed 4 sets of source rocks,five reservoirs and four sets of caprock rocks in the middle Yangtze area,which were significantly different between locations.During Caledonian-Indosinian period,the study area was tectonically reconstructed in a low level,hydrocarbon was concentrated in lithologic or stratigraphic-lithologic reservoirs in the uplift zone and on slope of the northern margin of the area.In the early Yanshanian Movement period,the structures were experienced intensive reconstruction,it allowed well preservation of the hydrocarbon accumulations in the slight reconstructing areas by adjustment and migration.In addition,in the proto blocks on the footwalls of the southern and northern nappes,good conditions also occurred for hydrocarbon accumulation.The deep burial of the Late Yanshanian Movement was beneficial for secondary hydrocarbon generation from the poorly evolving source rocks,gas was generated by pyrolysis in the residual paleo-oil pools.At present,accommodation-type reservoirs are in the weakly reconstructed areas,secondary hydrocarbon-generating type reservoirs are in the deeply buried areas,Upper Paleozoic stratigraphic-lithologic reservoirs,nappe-type reservoirs are on the margin of the orogeny belts,and gas shale is in the Cambrian and Silurian series are worthy areas to be explored.

关 键 词：海相层系 石油地质特征 勘探方向 中扬子地区 

分 类 号：P618.13[天文地球—矿床学]