摘要
随着多年高强度的勘探开发,老探区将不得不面对资源枯竭、资源劣质化的问题,大港油田所处的渤海湾盆地黄骅坳陷就是其中最典型的代表.黄骅坳陷的资源探明率已超过50％,在其近年来的新增探明储量中,深层、低渗透的储量占比在90％以上,这使得油田的原油稳产和可持续发展面临着更加紧迫的局面.近年来,中国在深层致密油气、页岩油气、煤层气等新类型油气勘探中接连获得突破,为老探区指明了勘探方向.对黄骅坳陷开展的深入、综合分析认为,黄骅坳陷在古近系深凹区、潜山内幕、页岩油、煤层气4个勘探领域仍具有重要的勘探潜力.基于对沉积体系和烃源岩分布特征的再认识,提出了深凹区发育源-储匹配良好的大型砂体,油气的强充注可形成大规模成藏;构建了潜山内幕层状油气成藏新模式,指出潜山内幕发育的白云岩储集层是除风化壳之外另一类全新的勘探领域;通过深化页岩油富集规律的认识,明确了纹层型页岩的"甜点层"和混合质页岩具有较大的页岩油勘探潜力;鉴于黄骅坳陷的石炭系—二叠系煤层分布面积广、厚度大、埋藏适中、具有良好生气潜力的特征,以及已发现源 自煤系烃源岩的天然气藏的现实状况,深部煤层气是下一步天然气勘探的重要新领域.黄骅坳陷4个领域的预计石油资源量为5.6×108t,天然气资源量为1397× 108m3,若获得勘探突破将夯实老探区可持续发展的资源基础.
Abstract
With years of intensive exploration and development,the problems of resource exhaustion and deterioration are encoun-tered in old exploration areas,typically represented by Huanghua depression of Bohai Bay Basin,where Dagang oilfield is loca-ted.The ratio of proven resources in Huanghua depression has exceeded 50％.Among the newly proven reserves in recent years,deep and low-permeability reserves account for over 90％.As a result,it is urgent to maintain the stable production and sustainable development of crude oil in the oilfield.In recent years,China has successively made breakthroughs in exploring new types of oil and gas such as deep tight oil-gas,shale oil-gas,and coal rock gas,indicating the exploration direction for old explo-ration areas.Through in-depth and comprehensive analysis,it is concluded that there is still great exploration potential in 4 ex-ploration areas of Huanghua depression,i.e.,Paleogene deep depression,inner buried-hill,shale oil,and coal rock gas.Based on the re-understanding of sedimentary system and source rocks distribution characteristics,it is proposed that large sand bodies with well-matched source-reservoir assemblages are developed in deep depression,and strong oil-gas charging can lead to large-scale hydrocarbon accumulation.Moreover,the paper constructs a new model of layered petroleum accumulation in inner buried-hill,and it is pointed out that besides weathering crust,the dolomite reservoirs developed in inner buried-hill represent another new exploration field.By deepening the understanding of shale oil enrichment regularities,it has been clarified that the sweet spot layers of laminar shale and mixed shale have great potential for shale oil exploration.Boasting of wide distribution area,large thickness,moderate burial depth,and good gas production potential of the Carboniferous-Permian coal seams in Huanghua depression,as well as the discovered natural gas reservoirs from coal-measure source rocks,deep coal rock gas is a new impor-tant area for further natural gas exploration.The oil resources in four fields in Huanghua depression are estimated to be 5.6 × 108 t,and the natural gas resources amount to 1 397 × 108m3.The breakthroughs in petroleum exploration can lay the resource foundation for the sustainable development of old exploration areas.
基金项目
中国石油前瞻性基础性战略性科技项目(2021DJ0702)
中国石油油气与新能源分公司重点科技项目(2022KT1002)
NETL
NSTL
维普
万方数据