塔里木盆地玉北地区奥陶系储层流体包裹体特征及油气成藏史  

Characteristics of fluid inclusions and hydrocarbon accumulation history in Ordovician reservoir of Yubei area,Tarim Basin

作　　者：吴小力[1] 李荣西[1] 李纯泉[2] 斯尚华 李得路[1] 赵帮胜 程敬华[1] 王建广 乔博 

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]中国地质大学资源学院,武汉430074 [3]西安石油大学地球科学与工程学院,西安710065 [4]中国石油华北油田分公司勘探开发研究院,河北任丘062552

出　　处：《兰州大学学报（自然科学版）》2017年第6期740-748,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(41173055);中央高校基本科研业务费专项资金项目(310827172101)

摘　　要：通过对玉北地区奥陶系储层流体包裹体进行岩相学观察、显微荧光光谱分析和显微测温分析,研究油气充注特征,划分油气成藏期次并确定其成藏时间.结果表明玉北地区奥陶系存在3幕2期油气成藏:第1期发生在海西晚期283~252 Ma,可分为2个幕次油气充注,其中第1幕(283~272Ma)以低成熟度油气成藏为主,第2幕(268~252 Ma)油气大规模成藏,具混源充注特征;第2期发生在喜马拉雅中-晚期16~3 Ma,主要以高成熟的油气成藏为主,油气成分较均一.在两期油气成藏中,海西晚期油气成藏规模大,为主成藏期.结合区域构造演化历史分析玉北地区奥陶系油气成藏史.Based on former research, the charging characteristics of the fluid inclusions in Ordovician formation of Yubei area were studied, the hydrocarbon accumulation stages classified and the hydrocarbon accumulation ages defined through the petrographic observation, microscopic fluorescence spectroscopic and microthermometry. The results showed that there was a ＂two-stage and three-episode＂ process of the hydrocarbon accumulation in the Ordovician formation of Yubei area. The first accumulation stage was in late Hercynian whose time span is 283-252 Ma and can divided into two episodes. The hydrocarbon of the first episode （283-272 Ma） was in low maturity. In the second episode （268-252 Ma）, the hydrocarbon largely accumulated and should have come from different hydrocarbon source rocks. The second accumu- lation stage was in the middle-late Himalayan whose time span is 16-3 Ma. The hydrocarbon was mostly in high maturity, whose chemical composition was homogenous. Between the two accumulation stages, that of the late Hercynian when hydrocarbon accumulated in a large scale should be regarded as the main accumulation stage. Combining the regional geological history with the accumulation time, this paper analyzed the hydrocarbon accumulation process in Ordovician formation of Yubei area.

关 键 词：流体包裹体 成藏期次 奥陶系 玉北地区 

分 类 号：TE122[石油与天然气工程—油气勘探]