石南断层分段特征及其对油气差异成藏的控制

Segmentation caharacteristics of Shinan fault and its control on differential
hydrocarbon accumulation

江涛,黄晓波,陶莉,胡安文,步少峰

JIANG Tao, HUANG Xiaobo, TAO Li, HU Anwen, BU Shaofeng

中海石油（中国）有限公司天津分公司，天津 300459

Tianjin Branch of CNOOC Ltd., Tianjin 300459, China

石南断层分段差异特征明显，对油气差异成藏具有明显的控制作用。根据断层走向、构造样式、断层活动性、断层断面形态等方面的差异，可将石南断层划分为东段、中段和西段。西段断面产状陡直，呈“板式”，为均匀型断面形态，油气主要在浅层聚集，聚集效率低，断层活动速率大；中段断面呈上陡下缓的“座椅式”，为汇聚型断面形态，倾角较缓，断层活动速率适中，具有复式成藏特征；东段断面呈“铲式”，为汇聚型断面形态，油气在深层、浅层均有富集，但断层活动速率较大，倾角较大，油气充满程度相对较低。进一步明确了石南断层分段特征及其对油气差异成藏的控制作用，为研究断层差异控藏作用提供了新的思路和方法。

The segmentation difference of Shinan fault is clear, which has obvious control effect on the differential hydrocarbon accumulation. According to the differences of fault strike, structural style, fault activity and fault morphology, Shinan fault can be divided into three sections: east, middle and west. The occurrence of the western fault section is sharp, and the fault is "plate type" and of uniform pattern. Oil and gas are mainly accumulated in shallow layer with low accumulation efficiency. The fault activity rate is high. The middle fault section is "seat type" with convergent morphology. The fault dip angle is low, the fault activity rate is moderate, and it has the characteristics of compound reservoir formation. The eastern fault section is "listric type" with convergent morphology, and oil and gas are enriched in both deep and shallow layers. However, the fault activity rate is high, and the dip angle is relatively large, so the degree of oil and gas filling is relatively low. The segmentation characteristics of Shinan fault and its controlling effect on hydrocarbon differential accumulation are further clarified, which provides new ideas and methods for the differential reservoir control of faults.

10.6056/dkyqt202105009