也门71区块构造特征与勘探方向浅析

Simple Analysis of Construction Characteristics and Observation Direction in YEMEN Block 17

也门71区块位于富含油气的塞云-马西拉(Sayun-Masila)盆地西部主体断陷内,夹持在南北边界大断层之间,以不对称的双断式为特征,剖面上呈"下断上坳"构造格局。上部白垩系断层较少,圈闭不发育;下部侏罗系、前寒武系基底断裂发育,受断层切割,形成了众多的断块、断鼻和断背斜圈闭。根据该区块构造特征、油气成藏条件研究,结合本区及相邻区块的油气勘探成果,提出区块西部鼻隆构造带是最有利的勘探区带,且西部基底断块组合是有利的成藏组合,应是下步油气勘探方向。

Block 71 lies in the west major fault depression of petroliferous Sayun--Masila basin in republic of Yemen. It is asymmetrically faulted between the south and the north boundary faults, structurally showing bottom fault and top depression on the sections. Few faults and traps were developed in Cretaceous formations. While basement fractures of Jurassic and pre--Cambrian are well developed to form numerous faulted blocks, faulted noses and faulted anticline traps cut by faults. Based on structural features and reservoir formation condition study and combined with exploration achievement of adjacent blocks, this paper suggests that west nose structure of block 71 is the most favorable zone for exploration. Basement faulted block pair in the west is the most available pair for next exploration.