埕岛地区中、古生界裂缝与油气的关系

MESO-PALEOZOIC FRACTURES IN CHENGDAO REGION AND THEIR RELATION TO OIL AND GAS

李理 戴俊生 谢传礼

Li Li Dai Junsheng Xie Chuanli

埕岛地区中、古生界发育两组裂缝:一组走向为NE30°,另一组为近EW走向。裂缝宽度为0.3～2.0mm,以中高角度缝居多。裂缝大部分形成于喜山期,燕山期亦有部分裂缝形成。喜山期的裂缝主要分布于埕岛地区南部和北部,因与油气主排烃期相匹配,是良好的油气储集空间及运移通道。燕山期形成的裂缝尽管早期被方解石充填,但由于受后期地下水溶解作用的影响,同样可形成有利的油气储集空间及运移通道。

Two groups of Mesozoic and Paleozoic fractures developed in Chengdao Region,one strike is northeast 30°,the other is nearly east west.The fractures'dip angles are mostly more than 70° and their width is 0.3～2.0 mm.Most of the fractures formed in Himalayan Period,some of them formed in Yenshan Period.The fractures formed in Himalayan Period are distributed in the south and the north parts of Chenodao Region,they are fine reservoiring spaces and migration passages since their formation time matched well with hydrocarbon expelling stage.The fractures formed in Yenshan Period could form favourable reservoiring spaces and migration passages.

10.11743/ogg20000317