【摘要】 塔河地区S112-2井于2005年在古生界碎屑岩中获得了高产油流,但由于其位于石炭系与志留系之间的不整合面附近,上下岩性接近,所以油层属于石炭系、东河砂岩还是志留系一直存有争议。该文通过对岩心、测井及地震资料综合研究,确认了S112-2井油藏的时代、构造与圈闭特征,认为该区志留系存在2种砂岩上倾尖灭圈闭:一种是舌状上倾尖灭圈闭,即砂体顶面为单斜,但尖灭线朝北上倾方向呈舌状突出;另一种是鼻凸上倾尖灭圈闭,即尖灭线平直,没有出现向北突出的舌头,但砂体顶面为一个鼻凸构造。后者是在该区发现的可能具有类似含油特征的一种新的圈闭类型。更多还原

【Abstract】 High-yielding oil flow was found in Paleozoic clastic rocks in Well S112-2 of Tahe region in 2005.The oil flow is on the unconformity interface between Carboniferous and Silurian;hence the origin still remains discussion.Based on core,logging and seismic data,the date,tectonic and trap features of the Well S112-2 reservoir were concluded.2 types of sandstone updip pinch out trap exist in Silurian in the region: a) tongue-shape ones,with monocline at the top of sandbody and pinchout line leading to the north;b) nose-shape ones,with nose-shape structure at the top of sandbody and straight pinchout line.The nose-shape ones are new trap types which may have similar oil-bearing features in the region.更多还原