东北含油气区中新生代断陷盆地石油地质特征及资源远景

Characteristics of Petroleum Geology and Petroleum Potential in Meso-Cenozoic Fault Basins in Northeastern Petroleum-bearing Provinces, China

东北含油气区位于西伯利亚地台和中朝地台之间。已发现大庆等一系列油气田,但98%以上的油气储量集中在松辽盆地,其他地区的勘探程度总体上仍很低,还有很多地区尚未勘探,而且深、浅层的勘探程度也不同。该区经历了两期断陷发育期及一期拗陷发育期,从而形成3套生油岩系,断陷期形成的有机质以腐殖型为主,煤系地层发育;拗陷期则以腐泥型有机质为主,暗色泥岩极发育。断陷期形成的各类扇体是烃类的主要储集层。指出今后应加强松辽盆地深层早白垩世断陷的天然气勘探,外围盆地的中央构造带也是勘探的主要目的区。总之,东北含油气区是一个油气勘探潜力很大的地区。

Northeastern petroleum-bearing provinces, in which a series of oil and gas fieldshave been found, is located between Siberian and Sino-Korean platforms. 98 percent of proved oiland gas reserves are distributed in Songliao basin. Little exploration has been carried out in other areasoutside Songllao basin, and there are many areas in which there is no exploration. Even in Songhaobasin, there exist differences in exploration between the upper and deep layers. The northeastern prov-inces underwent two faulting stages and one depressing stage, so three sets of source rocks wereformed The organic matter formed in faulting stages is type 2, and there is coal-bearing buildup.Theorganic matter formed in depressing stage is type 1, and there distributes widely black mud stone. Allkinds of fans formed in faulting stages are main reservoirs of hydrocarbon, In future, natural gas explo-ration of early Cretaceous fault basins should be enhanced in deep Songliao basin.The central struc-tural zones of the whole basin outside Songliao basin are the main areas to be explorated. In a word.northeastern petroleum-bearing provinces have great petroleum potentiality.