摘要
为了研究油源断裂在油气成藏中的作用,在油源断裂厘定、输导期和源岩生排烃期研究的基础上,通过比较油源断裂输导油气期与源岩生排烃高峰期之差和源岩生排烃高峰期与其开始生排烃期或停止生排烃期之差比值的大小,建立了一套油源断裂输导油气时间有效性的研究方法,并将其应用于松辽盆地徐家围子断陷油源断裂输导天然气时间有效性的研究中。结果表明:徐家围子断陷营城组火山岩储层在青山口组—姚家组沉积时期,油源断裂输导天然气时间有效性评价等级为好,最有利于天然气运聚成藏;嫩江组沉积末期,油源断裂输导天然气时间有效性评价等级为较好,较有利于天然气运聚成藏;明水组沉积末期,油源断裂输导天然气时间有效性评价等级为中等,不利于天然气运聚成藏;火石岭组—营城组沉积时期和古近系沉积末期,油源断裂输导天然气时间有效性评价等级均为差,均无天然气运聚成藏。该结果与目前徐家围子断陷营城组火山岩储层中流体包裹体均一温度揭示的天然气成藏时期相吻合,表明该方法用于研究油源断裂输导油气时间有效性是可行的。
In order to study the role of oil-source fault in hydrocarbon accumulation, based on the research of deter- mination of fault, period of oil transporting and source rock generating and expulsing, a set of research method of time effectiveness of hydrocarbon transporting by oil-source fault was established by comparing the size between the difference of hydrocarbon transporting period by fault and peak generation and expulsion period of source rock with the difference of peak generation and expulsion period of source rock and the beginning or ending generation and expulsion period, and it was applied to the research of time effectiveness of the time that gas transported by oil-source fault from the underlying Klsh source rock to the overlying K^yc volcanic reservoir in Xujiaweizi Rift of northern Song- liao Basin. The results show that： the time effectiveness of gas transporting by oil-source fault is good during the depo- sitional stage of Qingshankou Formation to Yaojia Formation, and it is favorable for gas migration and accumulation; the time effectiveness is relatively good during the late depositional stage of Nenjiang Formation, and it is good for gas migration and accumulation; the effectiveness evaluation rank is moderate during the late depositional stage of Mingshui Formation, and it is unfavorable for gas migration and accumulation; the time effectiveness is poor during the depositional stage of Huoshiling Formation and Yingcheng Formation, and the late depositional stage of Palaeogene, and there is no gas migration and accumulation. These results are in accord with the currently gas accumulation stage revealed by the homogenization temperature of fluid inclusions in K, yc volcanic rock of Xujiaweizi Rift, so it is proved that this method is feasible to study the time effectiveness of hydrocarbon transporting by oil-source fault.
出处
《岩性油气藏》
CSCD
北大核心
2016年第6期9-15,共7页
Lithologic Reservoirs
基金
国家自然科学基金项目"断层岩水压张裂漏油主控因素及张性破裂压力预测"(编号:41372154)资助
关键词
油源断裂
输导期
生排烃高峰期
时间有效性
研究方法
oil-source fault
transporting stage
peak stage of hydrocarbon generation and expulsion
time effectiveness
research method
