渤海海域石臼坨凸起东段地层岩性油气藏类型及成藏主控因素

在构造、沉积储层和烃源岩分析的基础上,剖析了石臼坨凸起东段地层岩性油气藏形成条件、类型和成藏主控因素,认为石臼坨凸起东段南北两侧的渤中凹陷和秦南凹陷发育沙三段、沙一二段和东下段三套烃源岩,烃源条件优越,受构造运动的影响形成走向斜坡型坡折、单断式陡坡坡折和沉积缓坡坡折,在东三段和沙一二段沉积了辫状河三角洲、扇三角洲优质储层,为地层岩性油气藏的形成提供了良好的条件。地层岩性油气藏类型主要为走向斜坡型地层油气藏、深断近岸厚扇型岩性油气藏和三角洲上倾尖灭型岩性油气藏等三种,渤中、秦南两个富生烃凹陷是地层岩性油气藏形成的基础,东营组巨厚泥岩的稳定分布和沙一二段、东三段优质储层的广泛发育是地层岩性油气藏形成的保障和关键。

Stratigraphic-lithologic reservoir type and hydrocarbon accumulation main controlling factors of Shijiutuo swell in Bohai Sea

Based on the analysis of structure,sedimentary reservoir and hydrocarbon source rock,the forming conditions,types and main control factors of stratigraphic lithologic reservoirs of Shijiutuo formation have been deeply analyzed.It is believed that hydrocarbon source rocks of Sha-3 member,Sha-1,sha-2 members and lower Dongying were de-veloped in Bozhong and Qinnan sag beside north and south of Shijiutuo swell.With good hydrocarbon source conditions,affected by tectonic movement,ramp slope break,single fault type steep slope break and slow slope fold have been formed.In Dong-3 member and Sha-1,Sha-2 members,braided river delta and fan delta reservoirs have been deposited,which provided good conditions for stratigraphic-lithologic reservoirs.Stratigraphic lithologic reservoir types are mainly of slope stratigraphic reservoirs,deep thick broken nearshore fan lithologic reservoirs and delta updip pinchout lithologic reservoirs.It is pointed out that in the Bozhong and Qinnan sag,these two rich hydrocarbon generation depression are the basis of stratigraphic lithologic reservoir formation,the stable distribution of dongying group of huge thick mudstone and one section,east three sections of the extensive development of high quality reservoirs is the guarantee of stratigraphic lithologic reservoir formation and the key.