塔里木盆地阿满过渡带奥陶系油气成藏期压力特征  

Pressure characteristics during hydrocarbon charging of Ordovician reservoirs in transitional zone between Awati and Manjar Depressions in Tarim Basin

作　　者：刘华[1,2] 王伸 蒋子月 刘永立 程斌[1] 赵珊 魏鑫 LIU Hua;WANG Shen;JIANG Ziyue;LIU Yongli;CHENG Bin;ZHAO Shan;WEI Xin(School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China;Xianhe Oil Production Plant of Shengli Oilfield Company,SINOPEC,Dongying 257000,China;Research Institute of Exploration and Development,Northwest Oilfield Company,SINOPEC,Urumqi 830011,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]中国石化胜利油田分公司现河采油厂,山东东营257000 [4]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《中国石油大学学报(自然科学版)》2025年第2期82-92,共11页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(42172147,41972141);中石油重大科技项目(ZD2019-183-002)。

摘　　要：为了明确油气充注期的动力条件,以实测压力为基础,综合利用流体包裹体显微观测、激光共聚焦分析和PVTx模拟等方法,对塔里木盆地阿满过渡带奥陶系的地层流体压力进行恢复。结果表明,研究区奥陶系储层发育黄—黄绿色、蓝绿色及蓝色荧光的油包裹体及气体包裹体,气液比分别小于5%、4%~8%及大于8%,伴生盐水包裹体的均一温度分别为70~80℃、90~100℃及130~140℃,存在加里东晚期、海西晚期及喜山期3期油气充注过程,对应的压力系数分别为1.03~1.29、1.05~1.31和1.09~1.61;随着油气成藏时期的变晚,地层超压幅度具有逐渐增加的趋势,且同一成藏期具有南高北低的分布特征;超压时空分布差异主要与烃源岩热演化程度南高北低、构造挤压南强北弱密切相关,此外,喜山期的原油裂解进一步提升了南部地区的储层超压。To determine the dynamic conditions of Ordovician reservoirs during hydrocarbon charging in the transitional zone between the Awati and Manjar depressions in Tarim Basin,formation fluid pressure was restored using a combination of microscopic observation,laser confocal analyses of fluid inclusions,and PVTx numerical simulation,based on current measured pressure data.The results indicate that yellow to yellowish-green,bluish-green,and blue oil inclusions,as well as gas inclusions,are present in the Ordovician reservoirs of the study area.Their corresponding gas-liquid ratios are in<5%,4%-8%,and>8%,respectively,while the homogenization temperatures of associated aqueous inclusions are in 70-80℃,90-100℃,and 130-140℃,respectively.These findings reveal three distinct hydrocarbon charging events occurring in the late Caledonian,late Hercynian,and Himalayan periods,with corresponding paleo-pressure coefficients of 1.03-1.29,1.05-1.31,and 1.09-1.61,respectively.Over time,the formation overpressure amplitude gradually increased,and the pressure coefficients within the same period exhibited a south-high,north-low pattern.The spatial variation in overpressure distribution is primarily controlled by thermal maturity of source rock,which is higher in the south and lower in the north,and tectonic compression strength,which is stronger in the south and weaker in the north.Additionally,oil cracking during the Himalayan period further enhanced reservoir overpressure in the Shunnan area.

关 键 词：流体包裹体 PVTx模拟 古压力恢复 碳酸盐岩 塔里木盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]