辽河盆地东部凹陷北段生排烃史模拟及分析

本区的生排烃史的研究是基于地史、热史的模拟基础上进行的,生排烃史的模拟是含油潜力预测的有效手段。从生烃强度来看,本区的生烃强度中心位于牛局-青龙台构造带,说明东部凹陷北段具备生烃洼陷,是形成独立的含油气系统的基础。本区三套烃源岩为:沙三段下部、沙一段和东营组。各时期的排烃量在东营组沉积末期达到高峰,反映了东营组末期右旋走滑运动对油气运移的巨大影响,是油气幕式运移的有利证据。本区的排烃强度中心位于牛局-青龙台构造带,油气呈发散式向两侧运移,因此,除本区的牛局-青龙台构造带外,茨榆坨高垒带和东部陡坡带也是油气聚集的有利场所。东营组时期是排油及排气量最大时期,占总排油量35.87%,占总排气量90.2%,沙三段沉积末期的排油量仅次于东营组沉积末期,说明本区的含油气系统至少有两个关键时刻。 

SIMULATION AND ANALYSIS ON THE HISTORY OF GENERATING AND EJECTING HYDROCARBON AT THE NORTHERN SECTION OF EAST SAG IN THE LIAOHE BASIN

Generating and ejecting hydrocarbon history of the research area is simulated on the basis of buried and thermal history.The simulation of generating and ejecting hydrocarbon history is the effective means to forecast the oil and gas potential.The generating hydrocarbon intensity cneter is Niuju-Qinglongtai depression,showing the there were generating hydrocarbon center in northern section of the East Sag that is the basis of petroleum systems.There are three set of hydrocarbon rocks i.e.Shasan,Shayi and Dongying Members.The high peak of the hydrocarbon ejecting qualities of all periods was reached at the end of Dongying Member deposition,reflecting the significant influence of dextral strike-slipping movement at the end of the period,which is the stronger evidence of oil and gas episode asembling.The center of ejecting hydrocarbon intensity is located in Niuju-Qinglongtai depression and hydrocarbon assembled dispersedly to the side laterally,so besides Niuju-Qinglongtai structural belt,Ciyutuo high rampart belt and eastern steep slope belt are also advantageous position of hydrocarbon assembling.The qualities of hydrocarbon ejecting were maximum at the end of Dongying Member deposition,account for 35.87% of oil ejecting,90.2% of gas ejecting,Shasan Member was the second,which demonstrated there are two critical moment of the petroleum systems in the area.