Oil and gas source and accumulation of Zhongqiu 1 trap in Qiulitage structural belt, Tarim Basin, NW China  

作　　者：LI Jian LI Jin XIE Zengye WANG Chao ZHANG Haizu LIU Mancang LI Dejiang MA Wei MAO Danfeng ZENG Xu 

机构地区：[1]Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China [2]The Key Laboratory of Gas Formation and Development,PetroChina,Langfang 065007,China [3]Guangdong University of Petrochemical Technology,Maoming 525000,China [4]Research Institute of Petroleum Exploration and Development,PetroChina,Tarim Oilfield Company,Korla 841000,China

出　　处：《Petroleum Exploration and Development》2020年第3期548-559,共12页石油勘探与开发（英文版）

基　　金：Supported by the China National Science and Technology Major Project(2016ZX05007-003);the National Natural Science Foundation of China(41802138)

摘　　要：Well Zhongqiu 1 obtained highly productive oil-gas stream in the footwall of Zhongqiu structure, marking the strategic breakthrough of Qiulitag structural belt in the Tarim Basin. However, the oil and gas sources in Zhongqiu structural belt and the reservoir formation process in Zhongqiu 1 trap remain unclear, so study on these issues may provide important basis for the next step of oil and gas exploration and deployment in Qiulitage structural belt. In this study, a systematic correlation of oil and gas source in Well Zhongqiu 1 has been carried out. The oil in Well Zhongqiu 1 is derived from Triassic lacustrine mudstone, while the gas is a typical coal-derived gas and mainly from Jurassic coal measures. The oil charging in Well Zhongqiu 1 mainly took place during the sedimentary period from Jidike Formation to Kangcun Formation in Neogene, and the oil was mainly contributed by Triassic source rock;large-scale natural gas charging occurred in the sedimentary period of Kuqa Formation in Neogene, and the coal-derived gas generated in the late Jurassic caused large-scale gas invasion to the early Triassic crude oil reservoirs. The Zhongqiu 1 trap was formed earlier than or at the same period as the hydrocarbon generation and expulsion period of Triassic-Jurassic source rocks. Active faults provided paths for hydrocarbon migration. The source rocks-faults-traps matched well in time and space. Traps in the footwall of the Zhongqiu structural fault have similar reservoir-forming conditions with the Zhongqiu 1 trap, so they are favorable targets in the next step of exploration.

关 键 词：Tarim Basin Kuqa foreland thrust belt Qiulitage structural belt oil and gas source oil and gas accumulation Zhongqiu1 trap 

分 类 号：TE321[石油与天然气工程—油气田开发工程]