巴楚—麦盖提地区主要油气藏原油地球化学特征及油源探讨

Geochemical features and sources of crude oils in Bachu-Maigaiti area

丁勇 贾存善 邵志兵

Ding Yong Jia Cunshan Shao Zhibing

中国石油化工股份有限公司 西北油田分公司 勘探开发研究院,乌鲁木齐 830011 中国石油化工股份有限公司 石油勘探开发研究院 无锡石油地质研究所,江苏 无锡 214126

Research Institute of Petroleum Exploration & Production, SINOPEC Northwest Oilfield Company, Urumqi, Xinjiang 830011, China Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

巴楚—麦盖提地区是重要的油气聚集区。玉北地区玉北1井在奥陶系鹰山组测试获25.2 m3/d的海相工业油气流。玉北奥陶系油藏与巴什托（普）油气田的原油是否同源是困扰该地区油气勘探并急需解决的问题之一。通过玉北1井、巴什托（普）主要油气藏（田）的原油地球化学特征研究、油—油对比、油源对比等综合分析，并类比塔河奥陶系原油进行了巴楚—麦盖提地区主要油气藏原油地球化学特征及油源探讨分析。综合研究认为玉北地区奥陶系的原油地球化学特征与塔河奥陶系原油相近。通过烃源有机相类比，认为玉北地区奥陶系原油可能来自塔西南地区中下寒武统斜坡相烃源岩；巴什托轻质油推测主要来自盆地—陆棚相寒武系烃源岩，部分来源于海陆交互相石炭系。

Bachu-Maigaiti area is an important focus area of oil and gas. In the Ordovician Yingshan Formation in well Yubei 1, industrial oil and gas flows of marine facies have been tested for 25.2 m3/d. It is urgent to solve the problem whether the crude oils from Ordovician of Yubei area and Bashituo oil field are of the same sources. Through the geochemical analysis, oil/ oil and oil/ source correlations of the crude oils from well Yubei 1 and Bashituo oil field, compared with the Ordovician crude oils from Tahe area, the geochemical characteristics of crude oil and oil source of the main oil-and-gas reservoirs in Bachu-Maigaiti area are discussed. The geochemical features of the Ordovician crude oils from Yubei area are similar to those of the Ordovician crude oils from Tahe area. According to the organic analogy of oil source, the Ordovician crude oils from Yubei area may originate from the Middle and Lower Ordovician source rocks of slope facies in the southwestern Tahe area. The light oils from Bashituo area mainly come from the Cambrian source rocks of basin-shelf facies, and partially from the Carboniferous source rocks of marine-terrigenous facies.

国家重大专项（2011ZX05005-004-002）资助。

https://doi.org/10.11781/sysydz201306683