黄骅坳陷下古生界深潜山油气聚集条件及成藏因素分析  

Accumulation Conditions and Reservoiring Factors of Deep Buried Hills of Lower Paleozoic in Huanghua Depression

作　　者：方杰[1] 吴小洲[1] 王居峰[1] 

机构地区：[1]中国石油勘探开发研究院地质所,北京100083

出　　处：《中国石油勘探》2013年第4期11-18,共8页China Petroleum Exploration

基　　金：国家科技重大专项"渤海湾盆地北部油气富集规律与增储领域研究"(2011ZX05006-005)

摘　　要：黄骅坳陷各洼槽区断裂发育,深潜山带构造类型多,分布面积广,且沙二—三段和石炭系—二叠系两套烃源岩热演化程度高,成藏条件有利;下古生界储集岩受潜山上覆地层分布范围及受剥蚀程度差异、断裂发育程度和潜流带发育程度这3种因素影响,其部分深潜山构造带上碳酸盐岩岩溶带也比较发育,故下古生界深潜山带具备了油气聚集有利条件。尤其是深潜山还具备5个有利成藏因素:即油气充注期较早,油气运移距离近,多期捕获油气,深层气多、储集条件要求较低,油气后期保存条件优越;但该区深潜山形成油气富集的关键因素取决于"供油窗"的存在或发育程度。南大港和港东两个深潜山带是重点目标区,但要解决的关键问题为:前者是南大港断裂和歧北断裂一侧下古生界碳酸盐岩地层是否存在"供油窗";后者是奥陶系潜山圈闭是否落实。Faults developed in all troughs in Huanghua Depression, and there are many types of structures in deep buried hills. Moreover, two sets of source rocks from the Second to the third member of Shahejie Formation or Carboniferous-Permian have higher thermal evolution degree and good reservoiring conditions. The Lower Paleozoic reservoir rocks are affected by three factors as the buried-hill overlying strata distribution range and different denudation degree, the faults development degree, and the underflow zone development degree. Also carbonate palaeokarst developed in some deeply buried hills. So deeply buried hills in Lower Paleozoic are favorable for hydrocarbon accumulation. Especially, there are five factors favorable for reservoiring, that is, the earlier hydrocarbon charge stages, the smaller migration distance, the multi phases of oil/gas trapping, the great amount of gas in the deep and lower demand for accumulation conditions, and the superior oil/gas preservation conditions in later stage. However, the key factor of oil/gas enrichment in the area depends on the presence or growth degree of ＂oil-supplying＂ window. Two deeply buried hill structures of Nandagang and Gangdong are the major targets of oil and gas exploration, but the key problems to be solved are： there is an oil-supplying window in Lower Paleozoic carbonate strata in Naudagang fault and one side of Qibei fault or not; whether the traps in Ordovician buried hills are fulfilled or not.

关 键 词：油气聚集条件 成藏因素 深潜山 下古生界 黄骅坳陷 渤海湾盆地 

分 类 号：TE112.2[石油与天然气工程—油气勘探]