旅大22—27区构造反转期次及其对油气成藏的控制作用

Tectonic inversion phases and their controls over hydrocarbon accumulation in Block LD22—27

对旅大22—27区反转构造的几何学特征、反转期次、形成机制进行了分析,并结合该区油气成藏时间探讨了反转构造对油气成藏的控制作用。旅大22—27区分别于沙河街组沉积末期、东营组沉积末期和明化镇组沉积末期发生了3期构造反转活动,这为该区油气生成、运移、聚集和保存创造了优越条件,但也带来了不利影响。中央断隆构造带两边的大断层下降盘,其地层沉积较厚,反转构造发育且紧邻生烃凹陷,是下一步勘探的重点区域。

The geometry, phases and mechanism of inverted structures are analyzed for Block LD22- 27, and their controls over hydrocarbon accumulation are discussed in terms of hydrocarbon accumulation time. There are 3 phases of tectonic inversion in the Block, i. e. at the latest Shahejie, the latest Dongying and the latest Minghuazhan,which are favorable to hydrocarbon generation, migration, accumulation and preservation, but have some negative effects too. The downthrown blocks on the two sides of Central Faulted Uplift Zone are the major areas of next exploration, because they have thicker deposional sequences and developed inverted structures, and are adjacent to the hydrocarbon-generation sag.