油源断裂向下输导油气时期厘定方法及其在松辽盆地三肇凹陷的应用  

Determination method of downward hydrocarbon transport period of oil source fault and application in Sanzhao Sag in Songliao Basin

作　　者：杨茗卉 YANG Minghui(No.2 Oil Production Company of PetroChina Daqing Oilfield Co Ltd,Daqing 163414,China)

机构地区：[1]中国石油大庆油田有限责任公司第二采油厂,黑龙江大庆163414

出　　处：《大庆石油地质与开发》2022年第6期51-57,共7页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“砂泥岩层系中油源断裂输导油气优势路径演化及识别研究”(41872157);国家自然科学基金项目“断砂配置侧向分流运聚油气机理及有利部位识别研究”(42072157)。

摘　　要：为了研究含油气盆地上生下储式油源断裂附近油气分布规律,在油源断裂向下输导油气机制及时期研究的基础上,通过断裂生长指数或地层剖面伸展率或活动速率,确定油源断裂活动时期;通过源岩生排油气时期和源岩向下排油气超压形成时期,确定源岩向下排油气时期,二者叠合建立了一套油源断裂向下输导油气时期的厘定方法,并将其应用于松辽盆地北部三肇凹陷油源断裂向下伏扶杨油层输导油气时期的厘定中。结果表明:三肇凹陷油源断裂活动时期为火石岭组—营城组、青山口组—姚家组沉积时期、嫩江组沉积末期、明水组沉积末期和古近系沉积末期,青一段源岩向下排油气时期为明一段沉积末期至现今;油源断裂向下伏扶杨油层输导油气时期应为明水组沉积末期和古近系沉积末期,与扶杨油层储层流体包裹体均一温度确定的油气成藏期一致,表明该方法用于厘定油源断裂向下输导油气时期是可行的。In order to study hydrocarbon distribution law near upper source and lower reservoir oil source faults in petroliferous basins,activity period of oil source faults is determined by fault growth index or formation section ex‑tension rate or activity rate based on study of mechanism and period of downward hydrocarbon transport of oil source faults.Based on hydrocarbon generation and expulsion from source rock and overpressure formation period of down‑ward hydrocarbon expulsion from source rock,the downward expulsion from source rock is determined.The two are superimposed,and a set of determination method of downward hydrocarbon transport period of oil source fault is es‑tablished,and is applied to determine hydrocarbon transport period of oil source faults to underlying Fuyang reser‑voir in Sanzhao Sag in northern Songliao Basin.The results show that activity period of oil source faults in Sanzhao Sag is the sedimentary period of Huoshiling Formation-Yingcheng Formation,Qingshankou Formation-Yaojia For‑mation,sedimentary end period of Nenjiang Formation,sedimentary end period of Mingshui Formation sedimentary end period of Paleogene.Downward hydrocarbon expulsion from source rock of Qing-1 Member is sedimentary end period of Ming-1 Member to the present.The period of hydrocarbon transport from oil source faults to Fuyang reservoir should be sedimentary end period of Mingshui Formation and sedimentary end period of Paleogene,being con‑sistent with that hydrocarbon accumulation period determined by uniform temperature of fluid inclusions,and indi‑cating that this method is feasible to determine the period of downward hydrocarbon transport from oil source faults.

关 键 词：油源断裂 向下输导 输导油气时期 厘定方法 三肇凹陷 

分 类 号：TE122[石油与天然气工程—油气勘探]