渤海湾盆地南堡凹陷火山岩特征及其有利成藏条件分析

研究表明,渤海湾盆地南堡凹陷火山岩发育区的岩浆活动热事件促进了烃源岩的早熟,有利于生烃和成藏.其火山岩与烃源岩的三种组合方式,具有良好的油源条件,且多分布在有利的圈闭上,具有油气富集的最基本条件.火山岩储集空间主要为裂缝、微裂缝和粒间溶蚀孔隙等,其发育主要受岩性、粒度、构造应力和充填期四大因素控制,其裂隙主要发育期和油气聚集期相近从而有利于聚油成藏.火山岩型油气藏的勘探将成为南堡凹陷油气储量和产量新的增长点.

CHARACTERISTICS OF IGNEOUS ROCKS AND THEIR FAVORA-BLE POOL-FORMING CONDITIONS IN NANPU SAG, BOHAI BAY BASIN

Based on extensive survey and research, characteristics of igneous rocks and their favorable pool-forming conditions in Nanpu Sag,Bohai Bay Basin have been analyzed and summarized. It is concluded that magmatic activities of igneous rocks area accelerate the maturation of sourcerocks, and promote the pool-forming. There are three combination types between igneous rocks and sourcerocks in Nanpu Sag, which guarantee a good oil source condition.While the distribution of most of igneous rocks at favorable traps, gives a base for oil and gas accumulation. Fractures, micro-fractures, and intergranular secondary pores are the primary preserving space for igneous rocks. The development of the preserving spaces is controlled by lithologic features, granularity, tectonic stress and the coincidence of filling stage with oil accumulation stage. Surely, exploration of igneous reservoir will be a new development point for increasing the reserve and production of Nanpu Sag in the future.