渤海湾盆地奥陶系潜山内幕油气成藏主控因素研究  

Major Control Factors of Hydrocarbon Accumulation in Ordovician Interior Buried Hills,Bohaiwan Basin

作　　者：吴小洲[1] 牛嘉玉[1] 吴丰成[1] 刘晓[1] 

机构地区：[1]中国石油勘探开发研究院

出　　处：《海相油气地质》2013年第1期1-12,共12页Marine Origin Petroleum Geology

基　　金：中国石油天然气股份有限公司课题"渤海湾盆地石油地质综合研究及有利区带评价"(编号:06-01D-01-02-01)部分成果

摘　　要：本文的渤海湾盆地奥陶系潜山内幕是指有石炭系—二叠系覆盖的奥陶系潜山。潜山内幕多为单斜平行结构,储层基本为非均质"似块状结构"。古近系为主的烃源岩,通过控山断层的断面输油,形成"新生古储"的成藏模式。奥陶系潜山内幕成藏有四项主控因素,按重要程度依次为生烃灶供烃潜能、有效输烃窗口、优势输导通道以及储层裂缝发育。同时具备四项有利主控因素的潜山,油气富集规模较大。在生烃灶供烃潜能有利的前提下,其他三项主控因素之一为不利时,仍有成藏的可能,但规模一般较小。潜山内幕的储集空间以裂缝为主,裂缝的发育程度受构造和控山断层形态的影响,背斜构造、弧形断层、多向交切断层有利于裂缝的发育,而受直线型断层控制的潜山裂缝欠发育。Ordovician interior buried hills here refer in particular to the discovered Ordovician buried hills that are overlaid by Carboniferous-Permian strata in Bohaiwan Basin. Most of the interior buried hills are monoclines in struc- ture and the buried hill reservoirs basically are anisotropic ＂blockoid textures＂. The hydrocarbon in Paleogene-predomi- nating source rocks migrated down along the mountain-controlling fault surfaces and accumulated into the Ordovician interior buried hills as a pattern of ＂source in the upper and reservoir in the lower＂ or ＂source late and reservoir old＂. It is indicated that the factors controlling with hydrocarbon accumulation in the interior buried hills are, in significant ex- tent, the hydrocarbon-generating potential of source rocks, the effective hydrocarbon-supplying window, dominant draining layers and the developing reservoir fractures. Hydrocarbon accumulation may be greatly enriched in scale in interior buried hills if all of four favorable controlling factors are possessed while hydrocarbon accumulation can still take place but may be small in scale if any one of other three controlling factors is not favorable. Fractures are the main reservoir space in interior buried hills and the development of these fractures is controlled by geological structures and faults shapes. Anticlines, arc faults and multidirectional crossing faults are favorable for developing fractures while the fractures controlled by liner faults are not so developed in buried hills.

关 键 词：渤海湾盆地 奥陶系 潜山内幕油气藏 成藏模式 控制因素 

分 类 号：TE112.31[石油与天然气工程—油气勘探]