Study On The Key Parameters Of Basin Modeling And Analyses On The Oil/Gas System In The Lishu Falt Depression Of Songliao Basin

The Lishu fault depression is located in the southeast uplift area of the Songliao Basin,a total area of about 2346km2.Shahezi Formation and the Yingcheng Formation are main source rocks.They have high abundance of organic matter and good prospects for oil and gas exploration.However,the predecessors have a less research in their history of maturity and regions Differences.Based on the evaluation of the geochemical characteristics of two sets of hydrocarbon source rocks in Shahezi Formation and Yingcheng Formation,wells(12)and two-dimensional(7)sections were simulated by PetroMod Basin simulation software.The comparison of the maturity history,the analysis of the oil and gas system in the pear depression,and the prediction of the favorable area of oil and gas accumulation.research shows:(1)The simulation results of typical single well maturity show that there are great differences in the maturity history of the two sets of hydrocarbon source rocks in the structural units of pear depression.Among them,the thermal evolution degree of organic matter is the highest in the mulberry belt depression.At present,the hydrocarbon source rocks of Shahezi Formation and Yingcheng Formation are in the dry gas stage The source rocks of the Shahezi Formation and the Yingcheng Formation in the northern slope zone and the Shuanglong sub-depression zone are currently in the oil phase;(2)Two-dimensional profile maturation simulation results show:(1)The source rocks of Shahezi Formation enter the mature stage in Sang Shutai depression zone,central tectonic zone and eastern slope zone.In addition to,the Sang Shutai depression zone in the mature stage,the other tectonic units are in the stage of oil and gas,of which: the central tectonic belt and the eastern slope zone are in the oil-producing and humid stage,and the Shuanglong sub-depression zone is in the low mature stage.(2)The source rocks of the Yingcheng Formation,except for the northern slope zone and the small part of the Shuanglong subwa depression,are still in the mature stage,and the other tectonic units are mature,and most of the areas of the mulberry tree depression have entered the high maturity Mature stage,central tectonic zone and eastern slope zone into the high mature stage;(3)According to the distribution map of hydrocarbon source rocks of Shahezi Formation and Yingcheng Formation and the distribution history of the two groups of hydrocarbonsource rocks and the analysis of oil and gas systems,three favorable zones are predicted,namely:(1)central tectonic zone And the southeastern slope zone in the middle of a favorable reservoir area,(2)Sangtuai depression belt west of the two types of favorable reservoirs,(3)Shuanglong sub-belt south of the three types of favorable reservoirs.