摘要
准噶尔盆地南缘西段下部成藏组合油气资源丰富,勘探程度低,厘清成藏过程对该区油气勘探具有重要的指导意义。利用流体包裹体岩相观察、均一温度测试、储集层定量荧光技术、全扫描荧光分析等实验方法,结合原油和天然气的物理及地球化学特征,以及单井埋藏史模拟、生排烃史恢复、构造演化史分析等成藏要素配置关系分析,系统研究了盆地南缘独山子背斜下部成藏组合的形成过程。研究表明:①独山子背斜头屯河组储集层中存在2期烃类包裹体,第一期为黄色荧光的液烃包裹体,烃类以低成熟—成熟原油为主,该期包裹体丰度低,油气充注强度较低,未形成规模油气藏;第二期为发蓝色荧光的成熟—高成熟轻质油包裹体,包裹体丰度较高。②独山1井头屯河组部分层段(6416 m、6493 m)储层颗粒表面吸附烃浓度较高,表明头屯河组存在油层,吸附烃以低密度轻质油为主;储集层中也可见沥青及沥青质较高的稠油,指示油气藏形成后遭受过一定程度破坏调整。③独山子背斜头屯河组油气充注最早始于古近纪早期,但油气充注量有限,并未形成规模油气藏,直至中新世时期(5~3 Ma),烃源岩生排烃强度显著增强,油气快速充注并形成油气藏,之后受到喜马拉雅构造运动的影响,油气藏遭受不同程度破坏改造,油气沿断裂向浅层溢散,早期的古油藏呈现为不同烃类饱和度的残留油层,部分层段饱和度较高(6416.9~6417.4 m、6493~6493.5 m),推测试油可获工业油流。
The basic petroleum geological conditions of large oil&gas fields formation is favorable for the lower accumulation assemblage in the southern Junggar Basin,where the degree of exploration and research is relatively low.Thus there is great significance for oil and gas exploration to further clarify the formation process of oil and gas reservoirs.Hydrocarbon accumulation process of the lower accumulation assemblage of the Dushanzi anticline in the southern Junggar Basin was investigated using an integrated fluid inclusion,quantitative grain fluorescence,total scanning fluorescence analysis,the oil and gas characteristics in combination with well burial history simulation,hydrocarbon generation and expulsion history,structural evolution analysis and reservoir forming chronology analysis techniques in the area.The results show that:(1)There are two stages of hydrocarbon inclusions in Toutunhe Formation reservoir in Dushanzi anticline.The first stage is yellow or yellowish brown fluorescent liquid hydrocarbon inclusions,and the hydrocarbon is mainly low mature crude oil.The low abundance of inclusions in this stage indicates that the oil and gas filling intensity is low,and no large-scale oil and gas reservoir was formed.The second stage is mature to high mature light oil inclusions with blue fluorescence,and the abundance of inclusions is high,which was the key reservoir forming stage.(2)The concentration of adsorbed hydrocarbon on the surface of some reservoir particles(6416 m,6493 m)in Toutunhe Formation of Well Dushan-1 is relatively high.The adsorbed hydrocarbon is mainly low-density light oil.Heavy oil with high asphaltene and asphaltene can also be seen in the reservoir.It is considered that the reservoir had been damaged and adjusted to a certain extent after formation.(3)The hydrocarbon charging of Toutunhe Formation in Dushanzi anticline started in the Early Paleogene,but the amount was limited,and no large-scale oil and gas reservoirs were formed.Until the Miocene(5-3 Ma),the intensity of hydrocarbon gener
作者
刘刚
李建忠
齐雪峰
朱明
袁波
庞志超
Gang LIU;Jian-zhong LI;Xue-feng QI;Ming ZHU;Bo YUAN;Zhi-chao PANG(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Research Institute of Petroleum Exploration&Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2021年第7期1009-1021,共13页
Natural Gas Geoscience
基金
国家科技重大专项(编号:2016ZX05046-001)
中国石油天然气股份公司超前基础研发基金项目(编号:2019D-500801)
中国石油天然气股份公司科技重大专项课题(编号:kt2020-0404)联合资助
关键词
成藏期次
成藏过程
流体包裹体
颗粒定量荧光
下部成藏组合
准噶尔盆地南缘
Reservoir accumulation stage
Reservoir accumulation process
Fluid inclusions
Quantitative fluorescence
Lower accumulation assemblage
The southern Junggar Basin
