陆丰凹陷S洼资源潜力及勘探方向

Resource Potential and Favorable Exploration Direction of S Depression in Lufeng Sag

陆丰S洼是陆丰凹陷西南部的一个潜在富生烃洼陷,但多年来油气钻探未能再获新的突破,有必要对洼陷勘探潜力再认识。在烃源岩方面,综合利用区域地质背景、已钻井及地震等资料,通过洼陷构造演化及文昌组沉积相等研究,认为洼陷发育较大规模的文昌组半深湖-深湖亚相优质烃源岩,预测资源量超3亿方油当量,具备形成富生烃洼陷的基本条件。在有利勘探方向方面,通过洼陷内部及周缘已钻井分析,明确“运移”和“断层封堵”是洼陷油气成藏的主控因素和关键问题,洼陷油气汇聚结果与主力烃源岩翘倾方向关系密切,分析显示与已获突破的A构造带具相似地质条件且对称分布的B构造带是有利勘探区带。

Lufeng S depression is a potential hydrocarbon-rich generation depression in the southwest of Lufeng sag,but no new breakthrough has been made in oil and gas drilling for many years,so it is necessary to recognize the exploration potential of the sag again.In terms of source rocks,comprehensive utilization of regional geological background,well-drilled and seismic data,through the study of structural evolution and sedimentation of Wenchang Formation,it is considered that the large-scale semi-deep to deep lake subfacies high-quality source rocks of Wenchang Formation are developed in the depression,and the predicted resources are more than 300 million cubic oil equivalent,which has the basic conditions for the formation of hydrocarbon rich depression.In terms of favorable exploration direction,through the analysis of drilled wells in and around the sag,it is clear that"migration"and"fault sealing"are the main controlling factors and key problems of hydrocarbon accumulation in the sag.The results of hydrocarbon accumulation in the sag are closely related to the warping direction of main source rocks.The analysis results show that structural belt 13,which has similar geological conditions to structural belt A,is a favorable exploration area Belt.