塔里木盆地塔深1井深层油气相态预测  

Petroleum Phase State Prediction in Deep Reservoir of Tashen-1 Well in Tarim Basin

作　　者：张海坤[1,2] 周世新[1] 付德亮[1,2] 巩书华[1,2] 李靖[1,2] 王保忠[1,2] 柳少鹏[1,2] 

机构地区：[1]中国科学院地质与地球物理研究所油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《天然气地球科学》2013年第5期999-1004,1068,共7页Natural Gas Geoscience

基　　金：国家重点基础研究发展规划"973"项目(编号:2011CB201102);国家自然科学基金项目(编号:41072105);国家重大专项项目(编号:2011ZX05008-004-01)联合资助

摘　　要：塔深1井是中国目前第一深井，其钻探深度为8408m，在6800～7358m处的下奥陶统一上寒武统碳酸盐岩中见有气态烃存在，而在底部8404～8406m处寒武系岩心中见有褐黄色的液态烃，如何解释该井深层油气相态特征是人们非常关注的问题。通过使用经验判识法和PVT相图法对深层油气相态进行了研究，组分Z值法和三角图经验法研究表明，该井在6800～7358m处的下奥陶统一上寒武统烃类流体可能为带油环凝析气藏。另外对塔深1井8406m处的烃类流体组成进行了恢复，并使用PVTsim相态模拟软件对深层油气的相态进行了模拟，研究表明塔深1井深层油气的临界温度为182℃，临界压力为52MPa，临界点温度位于临界凝析压力点与临界凝析温度点之间，且与临界凝析压力点非常接近，从深层流体组成、温度和压力条件分析，该井8406m处深部流体具有典型挥发性轻质油的相态特征，并非岩心中见到的纯液态烃或气态烃。The Tashen-1 well with depth of 8 408m in Tarim Basin is the deepest well in China. Natural gas was found at 6 800-7 358m in the Upper Cambrian and Lower Ordovician in this well, but the yellow liquid hydrocarbon has been discovered in cores sampled from reservoir of 8 404-8 406m. How to explain this phase characteristics is a very interesting problem for us. In this paper,phase behavior has been studied by empirical method and PT phase diagram. Z value and ternary diagram show that fluid distributing at 6 800 7 358m in the Upper Cambrian and Lower Ordovician is gas reservoir with oil ring or gas condensate reser- voir. Compositions of petroleum fluid in deep reservoir of Tashen-1 well have been recovered by integrating data of natural gas composition with chromatogram of saturated hydrocarbon. Simulating result from the phase modeling software PVTsim shows that critical point（182~C, 52MPa） of petroleum in deep reservoir of Tashen 1 well is located between critical condensate pressure and critical condensate temperature on the envelope line, which indicates the phase state character of volatile light petroleum. These phase characteris- tics are different from our observed pure gas or liquid hydrocarbon on the surface of well.

关 键 词：塔深1井 油气相态 PVTsim 深层油气 

分 类 号：P618.130.1[天文地球—矿床学]