汉留断裂带构造演化特征研究

Study on the Tectonic Evolution Characteristics of Hanliu Fault Zone

摘要: 在前人的研究成果的基础上，根据地震、地质等资料，运用断层落差法、断层生长指数法、平衡剖面技术对古近纪汉留断裂带构造特征进行了研究。结果表明：研究区发育主干断层走向北东向，次级断层走向北西，平面上断层组合样式有平行式、斜交式和羽状，剖面上断层组合样式有阶梯状、“Y”字形、复“Y”字形。古近纪受断层右旋走滑和逆牵引作用，研究区发育挤压背斜和滚动背斜构造。综合分析断层活动特征和构造演化剖面特征，将汉留断裂带古近纪构造演化分为四个阶段：阜一期–阜三期少量断层微弱活动阶段；阜四期–戴二期汉留断裂带基本形成与右旋活动阶段；三垛期汉留断裂带强烈活动与东部逆牵引发育阶段；盐城期–东台期稳定沉降阶段。通过对汉留断裂带构造演化特征的研究以期对油气勘探开发提供指导意见。

Abstract: Based on seismic data, geologic information and the previous research results, this article applies fault throw method, fault growth index and equilibrium profile method to research on the struc-tural characteristics of Hanliu Fault Zone in Paleogene. The results show that the main faults are north east and the secondary faults are northwest. Fractures have different forms: parallel-aligned, skew-type and pinnate-type on the plane, ladder-like style, Y-type and multiple Y-type on the profile. Affected by right-lateral strike-slip and antithetic drag of the faults, compression anticline and rollover anticline were formed in the study area. Combined with the fault activity characteristics and the tectonic evolution profile characteristics, the structure evolution of Hanliu Fault Zone in Paleogene could be divided into the following four stages: E1f1-E1f3 a few faults formed and they act weakly; E1f4-E2d2 Hanliu Fault Zone basically formed and moved dextrally; E2s1-E2s2 faults acted intensely and rollover anticline formed; Ny-Qd was steady subsidence period. Through studying the tectonic evolution characteristics of Hanliu Fault Zone, some suggestions about exploring oil and gas would be expected.