中国地质2025，Vol.52Issue(2)：650-664,15.DOI:10.12029/gc20220604002
新疆吐哈盆地胜北洼陷中侏罗统超压发育与致密气成藏
Characteristics of Middle Jurassic overpressure and tight gas accumulation in Shengbei Sub-sag,Turpan-Hami Basin,Xinjiang
摘要
Abstract
This paper is the result of oil and gas exploration engineering. [Objective]The tight gas in the Shengbei subsag of the Turpan-Hami Basin has become an important field for expanding new exploration battlefields and discovering new reserves.The development characteristics and accumulation mechanism of tight reservoirs have become one of the key scientific issues that need to be solved urgently.[Methods]Using comprehensive research methods such as geochemistry,geophysics and oil and gas geology,the characteristics and accumulation stages of tight gas sources and reservoirs in the Middle Jurassic were systematically analyzed,and characteristics of overpressure development and the controlling effect on tight gas accumulation were determined.[Results](1)The organic matter type of the main source rocks is mainly type III kerogen,and the whole is in the mature stage dominated by gas generation.Middle Jurassic developed low porosity and low permeability-low porosity and ultra-low permeability tight reservoirs,with an average porosity of 7.1%and an average permeability of 0.074×10-3 μm2.The pore type is dominated by secondary dissolution pores,while clay mineral interlayer pores,pyrite intercrystalline pores and micro-fractures are developed.(2)The Middle Jurassic developed overpressure caused by pressure conduction and hydrocarbon generation pressurization.The pressure coefficient was mainly distributed between 1.2 and 1.5.The overpressure top interface was located in the middle and upper part of the Qiketai Formation vertically.The overpressure is mainly distributed in the east and southeast of the Shengbei subsag,and the fault system controls the distribution range of the overpressure.(3)The hydrocarbon expulsion from source rocks lasted for a long time.From Late Triassic to the present,there have been at least two main periods of natural gas charging,and the two main accumulation periods are:Late Jurassic to Early Cretaceous and Paleocene to date.[Conclusions]The Middle Jurassic tight gas reservoirs are dominated by the accumulation model of"two-stage accumulation from far-source and near-source,pressure-fault coordinated transport,and fault-overpressure coordinated control".The research results in this paper will provide scientific basis and technical support for tight gas exploration and development in Shengbei Sub-sag.关键词
致密气/超压与成因/成藏期次/油气勘查工程/胜北洼陷/吐哈盆地/新疆Key words
tight gas/overpressure and origin/accumulation period/oil and gas exploration engineering/Shengbei Sub-sag/Turpan-Hami Basin/Xinjiang分类
天文与地球科学引用本文复制引用
徐雯,石湘,程甜,姜继连,饶松,王晓龙,肖七林,万泽鑫,鲍一遥,刘宇坤,陶泽,佘家朝..新疆吐哈盆地胜北洼陷中侏罗统超压发育与致密气成藏[J].中国地质,2025,52(2):650-664,15.基金项目
国家自然科学基金(41702135)和十四五前瞻性性项目(2021DJ0405)联合资助. Supported by National Natural Science Foundation of China(No.41702135)and 14th Five-Year Forward-looking Projects(No.2021DJ0405). （41702135）
