南黄海盆地海相中、古生界油气资源潜力研究

在对南黄海盆地海相中、古生界烃源条件和后期保存条件研究的基础上,运用盆地模拟手段并结合前人研究成果,对海相地层烃源岩的排烃史进行了模拟,计算了海相地层油气资源量,从而进行了海相油气资源潜力的分析;同时通过对海相上构造层和下构造层两套含油气系统成藏条件的研究,预测了盆地内海相油气资源的有利运聚区,进而指出南黄海盆地海相油气勘探的有利区,为下一步南黄海盆地的勘探部署提供了依据。研究表明,南黄海盆地海相下构造层和海相上构造层栖霞组、龙潭组—大隆组烃源岩推测为好的烃源岩,海相上构造层青龙组烃源岩推测为中等—好的烃源岩;盆地海相地层具有一定的油气资源潜力,油气资源总量为35.37×10^8t,且在纵向上,油气资源主要来自海相下构造层烃源岩系,在平面上主要分布于南部坳陷;盆地海相地层存在两类油气资源勘探有利区,其中,最有利区位于中部隆起区南部、南部坳陷区和勿南沙隆起区北部。

Hydrocarbon resources potential study in Mesozoic-Palaeozoic marine strata in the South Yellow Sea Basin

Hydrocarbon resources condition and later stage reservation condition of Mesozoic-Palaeozoic marine strata were studied in the South Yellow Sea Basin.On the basis of this study,basin modeling means was used referring to the study of the predecessors to simulate hydrocarbon expelling history of marine source rocks and calculate the oil and gas resources,and the hydrocarbon resources potential was also evaluated.At the same time,the favorable accumulation area was forecast through the pool-forming conditions study of the two marine petroleum systems of upper structural layer and lower structural layer,and then favorable exploration areas in the South Yellow Sea Basin was pointed out,which provided basis for next exploration.The results showed that in the South Yellow Sea Basin,source rocks of lower structural layer and Qixia,Longtan-Dalong Group of upper structural layer are presumed to be good source rocks,and Qinglong Group of upper layer is presumed to be middle-good source rocks.Total amount of oil and gas resources in marine strata of the South Yellow Sea Basin is 3.537 billion tons,of which,in the vertical,oil and gas resources are mainly from source rocks of the lower structural layer,and in the plane,oil and gas resources are mainly distributed in the southern depression.There are two types of favorable oil and gas exploration area in the marine strata,in which the most favorable area is located in south of the central uplift,southern depression area and north of Wunansha uplift.