贵州及云南东部海相沉积区的油气前景

贵州及云南东部海相沉积区,面积约29万平方公里。自1956年全面开展找油工作以来,投入了大量工作量:完成全区地质概查、普查和主要构造的详查细测,完成全区重磁力普查,圈定了200余个地表局部构造,并在少数构造上作了地震试验;测制地层、岩相、含油性剖面及地质横剖面1400余公里;发现油气沥青点700余处;采集、分析各类样品近20万件。贵州地区历年来在59个构造上进行了钻探,共钻井217口(其中石油部126口,尚不包括赤水地区),总进尺150余公里,其中,2000—4500米深的钻井15口。滇东地区,石油部自七十年代以来在15个构造上进行了钻探,井深大于2000米的钻井有17口,总进尺50余公里。

The Future of Petroleun and Nature Gas at Sea Facies Sedimentary Area in Guizhou and Yunnan Provinces, China

Reported here is the main geologic condition of the oil and gas origin by analyses of typical ancient oil accumulation, oil and gas and asphalt in Guizhou and eastern Yunnan Proviinces. Caledonian period was of the most importance for the origin of oil and gas, migration and accumulation, but it also was the period during that time some ancient oil accumulations were seriously destroyed in the area. The oil-gas-bearing formation mainly formed in Devonian of Hercynian period was seriously eroded and washout in the later of time. The intense folds, foults in Yanshanian period and the rising, erosion in the later of the time resulted in destroying some shallow-buried oil and gas accumulations in Mesozoic and upper/lower Paleozoic. There are 21 oil and natural gas regions in an area of 94, 000 km2 and the reserve of them was estimated to be several hundred millions of cubic meters. Authors pointed out that to recover the oil and the natural gas is a great deal of difficulties. Preceed from actual conditions of the area, e smaller safekeeping, ron-convention and surviving gas accumulations should be based upon to be found.