准噶尔盆地盆1井西凹陷侏罗系原油成因与来源  

Origin and source of Jurassic crude oil in well Pen-1 western Depression, Junggar Basin

作　　者：刘华[1,2] 孟祥雨 任新成 程斌[1] 程长领 邓旭波[3] 张洪瑞[1] 方旭庆 LIU Hua;MENG Xiangyu;REN Xincheng;CHENG Bin;CHENG Changling;DENG Xubo;ZHANG Hongrui;FANG Xuqing(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;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257015,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]中国石化胜利油田勘探开发研究院,山东东营257015

出　　处：《中国石油大学学报（自然科学版）》2023年第1期25-37,共13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)。

摘　　要：准噶尔盆地多套烃源岩、多期生排烃过程导致了原油来源的复杂性。利用原油物性、气相色谱-质谱等资料,综合厘定盆1井西凹陷原油的地化特征与来源。结果显示,研究区存在3种类型原油:Ⅰ类原油具有高含量25-降藿烷、高含量伽马蜡烷和大斜率“上升型”三环萜烷分布特征,是强还原沉积环境有机质形成的主生油窗阶段原油,来自于风城组烃源岩;Ⅱ、Ⅲ类原油具有较低含量伽马蜡烷和“山峰型”或弱“上升型”三环萜烷分布特征,是弱还原沉积环境有机质形成的原油,原油主要来自下乌尔禾组烃源岩,混有降解的风城组来源原油,其中,Ⅱ类原油是主生油窗阶段的原油,Ⅲ类原油是高过成熟阶段的原油。油藏具有多期充注特征,中晚侏罗世聚集的Ⅰ类原油分布广泛,但遭受了强烈生物降解,对成藏贡献小;晚白垩世聚集的Ⅱ类原油在砂体中长距离运移,多在凸起区汇聚成藏;新近纪,储层物性变差,原油难以长距离运移,该时期聚集的Ⅲ类原油多在断裂带附近成藏。Multiple sets of source rocks and multi-stage hydrocarbon generation and expulsion process in Junggar Basin lead to the complexity of crude oil source. Geochemical characteristics and origin of the crude oil in the well Pen-1 western depression were determined by using the data of crude oil physical properties and gas chromatography-mass spectrometry. The results show that there are three types of crude oil in the study area: the type Ⅰ crude oils have the characteristics of high content of 25-norhopane, high content of gammacerane and high slope "ascending" tricyclic terpanes. They are the main generation window stage of organic matter formation in strong reduction sedimentary environment and come from source rocks of Fengcheng Formation. Type Ⅱ and type Ⅲ crude oils have low content of gammacerane and distribution characteristics of "peak type" or "weak rising type" tricyclic terpanes, and are formed from organic matter in weakly reduced sedimentary environment. The crude oils mainly come from source rocks of Lower Wuerhe Formation, mixed with degraded crude oils from Fengcheng Formation. Among them, the type Ⅱ crude oils belong to the main generation window stage, while the type Ⅲ crude oils belong to the high and over-mature stage. The reservoir has the characteristics of multi-stage charging. The type Ⅰ crude oil accumulated in the middle and late Jurassic was widely distributed, but suffered from intense biodegradation and made little contribution to reservoir formation.The type Ⅱ crude oil accumulated in the late Cretaceous can migrate in the sand body for a long distance and mostly converge in the uplift area.In the Neogene, the physical properties of reservoirs became worse, and it was difficult for crude oil to migrate over long distances. The type Ⅲ crude oil accumulated in this period mainly formed near fault zones.

关 键 词：准噶尔盆地 原油地化特征 生物标志化合物 油气成因 成藏过程 

分 类 号：TE122.3[石油与天然气工程—油气勘探]