黄骅坳陷深部地壳构造及流体特征与潜山油气藏勘探远景

由于南堡油田的发现，使黄骅坳陷的石油勘探引起人们的广泛关注。根据坳陷深部地壳构造特征， 中、下地壳有低速层，其深度分别为15 km 和20 km。中地壳低速层富含气体（如CO₂，CO，H₂等），在合适的温度、压力条件下，这些气体可合成甲烷及其它烃类化合物。坳陷的地幔流体活动（如碱交代，Mg ²⁺ 交代等）以及幔源CO₂，CH₄和He 气体（港151 井）都表明了它们均来自深部热液流体。黄骅坳陷发育多个潜山构造带（沈青庄、孔店、北大港、南大港、羊三木等），按照油气无机成因的假说，深部潜山带（而不是在第三系砂岩）中可望找到几个大型油气田（如千米桥潜山油气田）。

Deep crust structure and geofluid features of Huanghua Depression and their implications for petroleum exploration of buried hills

Petroleum exploration of Huanghua Depression is very concerned due to the discovery of Nanpu Oilfield. Based on the deep crust structure features, there are double low velocity layers in the mid-crust, with depth of 15 km and 20 km respectively. It is known that the low velocity layer of mid-crust is rich in gases （such as CO2, CO, H2 etc.） which can synthesized into hydrocarbons under the moderate temperature and pressure conditions. The mantle fluid activities （such as alkaline metasomasis and Mg^2＋ metasomasis） and the mantle source CO2, CH4 and He gases （Gang 151 well） in the basin imply that they came from the deep hydrothermal fluids. Several buffed hill structures developed in Huanghua Depression, such as Shenqingzhuang, Kongdian, Beidagang, Nandagang, Yangsanmu and so on. According to the inorganic genetic hypothesis, there are some large oil and gas reserves in the deep buffed hills, rather than in the Tertiary sandstone lithologic reservoirs.