凤河营潜山成藏条件再认识及勘探潜力分析

Re-understanding of Accumulations Conditions in Fengheying Buried Hill and Analysis of Exploration Potential

廊固凹陷凤河营潜山已有40多年的勘探历史,发育有潜山顶和潜山内幕两种油气藏类型,潜山顶勘探程度较高,但潜山内幕勘探程度却很低。通过对潜山构造发育特征、油源条件、储盖组合、油气输导体系、圈闭类型等的研究结果表明:凤河营潜山具有形成早、定型晚于生排烃高峰期的特点,但潜山内幕圈闭却具有形成、定型均早于生排烃高峰期的特点。潜山内幕发育多套含油层系,内幕油藏多次充注、持续运聚,分析认为,凤河营潜山内幕具有更好的勘探潜力。其中京101潜山具有潜山顶和内幕(府君山组、雾迷山组)两种类型圈闭3套目的层段,是突破凤河营潜山及潜山内幕勘探的首选目标。

Fengheying buried hill of Langgu Depression has an exploration history of more than four decades. It saw development of two types of hydrocarbon reservoirs buried hill top and buried hill inner curtain. Exploration degree is high for buried hill top but low for buried hill inner curtain. Based on the study of buried hill s development characteristics, oil source conditions, reservoir-cap assemblage, oil and gas transportation systems and types of trap, the results indicate that Fengheying buried hill is characterized in early development and shaped in a late period at the peak of hydrocarbon sourcing and expulsion. However, the trap of buried hill inner curtain has the characteristic that it was developed and shaped earlier than the peak of hydrocarbon sourcing and expulsion. A number of sets of oil formation series developed in the buried hill inner curtain that is filled and injected many times and migrated continually. Based on the analysis, Fengheying buried hill has a better potential for exploration. Of that, Jing-101 buried hill has three sets of oil formation series which belong to the two types of buried hill top and inner curtain (Fujunshan Formation and Wumishan Formation). They are the top targets for making breakthrough in exploration of Fengheying buried hill and its inner curtain.