塔里木盆地柯克亚地区原油差异与成因分析

ANALYSIS OF THE DIFFERENCES AND GENESIS FOR THE KEKEYA OIL IN TARIM BASIN

王东良 李勇 敬兵 李建立 国建英 曾昌民 张现军 冯晓军

Wang Dongliang Li Yong Jing Bing Li Jianli Guo Jianying Zeng Changmin Zhang Xianjun Feng Xiaojun

中国地质大学, 北京, 100083 2. 中国石油勘探开发研究院, 廊坊分院, 河北廊坊, 065007 3. 塔里木油田公司, 勘探开发研究院, 新疆, 库尔勒, 841000 4. 中国矿业大学, 北京, 100083 5. 华北油田公司, 勘探开发研究院, 河北, 任丘, 062552

China University of Geosciences, Beijing 100083, China 2. Langfang Branch of Research Institute of Petroleum Exploration & Development, Petro China, Langfang, Hebei 065007, China 3. Exploration & Development Research Institute, Tarim Oilfield Company, Kuerle, Xinjiang 841000, China 4. China University of Mining & Technology, Beijing 100083, China 5. Exploration & Development Research Institute, Huabei Oilfield Company, Renqiu, Hebei 062552, China

塔里木盆地柯克亚油气田主要含油气层系为新近系中新统西河甫组(N1x)、古近系卡拉塔尔组(E2k)和白垩系。研究表明,该区原油的物性、族组成、饱和烃色谱、饱和烃甾烷、萜烷、碳同位素和中性含氮化合物等参数在纵向和平面上均呈现出有规律的变化。在纵向上,原油密度、咔唑的丰度由下而上逐渐降低,而原油饱和烃含量、C21-/C22+、C21+22/C28+29、C27重排甾烷/C27规则甾烷、碳同位素和气/油比等参数自下而上有逐渐增大的趋势,这些变化趋势主要归结于自下而上的运移分馏作用;而不同层系或同一层系不同油组平面上的特征差异主要受储层沉积相带和物性的制约,是分类聚集作用的结果。

The oil-and gas-bearing strata are the Neogene Xihepu Formation(N1x),the Paleogene Kalata Formation(E2k)and the Cretaceous in Kekeya oilfield,Tarim Basin.Researches show that,in this area,the oil properties,group components,saturated hydrocarbon chromatograms,saturated hydrocarbon steranes,terpanes,carbon isotopes,nitrogen compounds etc.have regularly changed in spatial distribution.The density and the concentration of carbazole of the crude oil decrease gradually from the deep to the shallow,while some other parameters,such as content of saturated hydrocarbon,C21-/C22+,C21+22/C28+29,reset/regular steranes,carbon isotope and ratio of gas to oil,increase gradually from the deep to the shallow.These varying tendences in vertical were due to migration fractionation from the bottom to the top.Besides,the lateral differences between different strata or between the different oil-bearing formations in the same stratum are mainly controlled by the sedimentary facies belt and physical properties of reservoirs.And they are induced by grouped accumulation.

国家"十五"科技攻关项目(2004BA616A02-01-02-04)

https://doi.org/10.11781/sysydz200702192