松辽盆地北部安达凹陷生烃灶独立性研究及其石油地质意义

Isolation of hydrocarbon-generation kitchen in Anda Sag of northern Songliao Basin and its petroleum geological significance

安达凹陷毗邻松辽盆地北部的三肇凹陷,具有良好的石油地质条件,近年安达凹陷中浅层已经显示出较好的油气勘探潜力。多年来,油源问题制约着该区的油气勘探进程。本文通过平衡剖面方法,开展安达凹陷与其南部三肇凹陷、北部黑鱼泡凹陷、西面大庆长垣、东面明水阶地等周边构造带演化关系的对比研究,结合地球化学指标,提出安达向斜在构造上是一个独立的凹陷,具备形成独立生烃灶的次级含油气系统。在此基础上,指出安达凹陷西部、北部构造带具有极大勘探潜力,其中断层—岩性油气藏是下一步油气勘探的主要方向。

Anda Sag is adjacent to Sanzhao Sag in the northern Songliao Basin and has good petroleum geological conditions for generating petroleum.The shallow-middle layers in Anda Sag have displayed good oil and gas exploration potential in the recent years.But it is still a puzzle about the unclear oil source,which restricts the exploration in this area.The structural evolution relations of Anda Sag with the surrounding structural belts,such as Sanzhao Sag in the south of Anda Sag,Heiyupao Sag in the north,Daqing placanticline in the west and Mingshui terrace in the east,were studied using the balanced section.The assay data and geochemistry indicator show that Anda syncline is an isolated sag and possesses the conditions for forming the isolated hydrocarbon-generation kitchen.According to the oil-source correlation,the structural belts in the west and north parts of Anda Sag have great exploration potential and the further exploration object should be focused on the fault-lithologic reservoirs.