东营河125断层几何学特征及其对浊积扇和油藏的控制作用

Geometric Characteristics of the He-125 Fault and Its Control over Sediment and Reservoir Distribution,Dongying

通过对河125断层几何学特征的分析发现弧形断裂平行于断层走向剖面上表现为断槽、断脊组合;垂直于断层走向剖面上断层分为竖滑段、倾滑段和平滑段3段,生长指数规律为弧中大于弧翼,断层倾角规律为弧中小于弧翼。断裂的几何学特征与运动学特征具有相关性。断层几何学特征对浊积扇具有重要的控制作用:平面上,弧中位置浊积扇最发育,弧翼为不同浊积扇的分界线;断槽为浊积砂体的补给通道,断脊为扇体不同补给区的分水岭;垂向上,倾滑段下部发育远岸浊积扇,中上部发育滑塌浊积岩,形成典型的弧扇对应现象。断层对油藏的控制表现为:控制储层展布、改善储层物性、沟通油源和形成生长背斜及断鼻油气藏。

Based on researches on characteristics of the He125 fault, the authors have found that the arcuate fault is parallel to the fault strike and is the combination of fault-trough and fault-ridge, as evidenced from the profile. In the cross section, the fault can bedivided into three parts, namely, vertical-slip part, clip-slip part and horizontal-slip part. A compari- son of their growth indices shows that the arc center is greater than the arc flank, but things are just the opposite for their fault clip. There exists some relationship between the geometric features of the fault and its kinematic characteristics. Different geometric characteristics of different localities show the difference of their kinematic characteristics. Geometric features of the fault system control the distribution of sediments. Viewed from the surface, the arc center is the counterpart of the turbidite fan, the arc flank is the boundary of the turbidite fans, the fault trough is the recharge path of the tur- bidite fan, and the fault ridge is the watershed line of different recharge areas. Viewed from the cross section, the lower clip-slip part corresponds to far-bank turbidite, and its middle and upper part corresponds to the slump turbidite fan, thus forming a typical corresponding phenomenon for the arc and fan. The fault characteristics also play an important role in migration pathway and hydrocarbon accumulation.