黄骅坳陷沈家铺地区孔一段辉绿岩储集特征研究
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摘要
沈家铺地区位于黄骅坳陷孔南地区,构造上位于孔店潜山构造带中部,是被北东向和北西向两组断层复杂化的背斜构造。该地区孔一段岩浆岩发育,并在其中发现油气藏。依据钻井、测井及地震资料,综合利用多种方法 ,对孔一段岩浆岩特征进行研究,认为该区全为浅层侵入的辉绿岩,不发育喷出岩。辉绿岩储集空间主要由孔隙和裂缝组成,在后期构造运动及沿断层渗入的地表水的风化淋滤作用的改造下,裂缝及溶蚀孔洞发育,并聚集油气,形成油气藏。辉绿岩有效储集空间发育及围绕张性断裂带分布是成藏的关键。沈家铺地区辉绿岩分布范围广,有利区域主要分布在孔西断层上升盘靠近断裂的部位,以及下降盘的断层活动强烈、构造裂缝发育区域,如孔西断层上升盘家8断块北、孔西断层下降盘官992断块以西以及枣22断块北部。搞清辉绿岩的分布规律及与油气藏的关系,有利于该地区辉绿岩油藏的开发,且有利于该地区的构造演化分析、复杂断块油藏特征研究及区块调整。
Shenjiapu region is located in Kongnan area of Huanghua depression. It is an anticline structure in the central part of Kongdian buried hill structure belt complicated by northeastern and northwestern faults.Magmatic rocks exist in the first member of Kongdian formation(Ek1) in Shenjiapu region of Huanghua depression,in which hydrocarbon reservoir is found.Based on drilling,logging and seismic data,characteristics of the magmatic rocks of Ek1 in Shenjiapu region are researched using various methods comprehensively.Shallow intrusion diabase distributes in the whole study area without extrusive rocks.The reservoir spaces of the dia-base are mainly composed of pores and cracks.Cracks and solution vugs are developed and accumulated to form hydrocarbon reservoirs under the later tectonic movement and weathering and leaching of surface water infiltrated along the faults.The developed reservoir space of the diabase and their distribution around tension fault zone are the key of oil accumulation.The diabase in Shenjiapu region distributes widely and its favor-able area distributes at the position of uplifted wall of Kongxi fault near fractures and throw wall with strong fault activity and developed structure fractures,for example,the north of Jia8 fault block of the uplifted wall and the west of Guan992 fault block and the north of Zao22 fault block of the throw wall of Kongxi fault.Known distribution rule of the diabase and its relationship with the oil reservoir is favorable to the develop-ment of diabase oil reservoir,analysis of structural evolution,research on complicated fault block reservoir characteristics and block adjustment in the region.
引文
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