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The components and carbon isotope of the gases in inclusions in reservoir layers of Upper Paleozoic gas pools in the Ordos Basin,china

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Science china Earth Sciences 2008年第S1期51卷 115-121页

作者： mi jingkui 1 ,dai jinxing 1 ,{2.,zhang wenzheng 2.,gong se 1 &li xianqing 3 1 research institute of petroleum exploration and Development,petrochina,beijing 100083,{12. 2.exploration and Development research institute of petrochina Changqing Oilfield Company,Xi’an 71002.,{12. 3 Key Laboratory of Coal Resources,ministry of Education,{12. University of miningand Technology,beijing 100083,{12. research institute of {2. exploration and Development PetroChina Beijing China exploration and Development research {2. of petrochina Changqing Oilfield Company Xi’an China Key Laboratory of Coal Resources Ministry of Education China University of Miningand Technology Beijing China

The components and carbon isotope of gases in inclusions are one of the most important geochemical indexes for gas *** analysis results of the components and carbon isotope of gases from inclusions in reservoir layers of Upper Palaeozoic gas pools in the Ordos Basin show that most inclusions grown in reservoir sandstone are primary *** is only a little difference about the components and carbon isotope between the well gases and the secondary inclusions *** indicated that the epigenetic change of gas pools is *** difference between the well gases and the secondary inclusions gases is caused by two reasons:(i)The well gases come from several disconnected sand bodies buried in a segment of depth,while the inclusion gases come from a point of depth.(ii)The secondary inclusions trapped the gases generated in the former stage of source rock gas generation,and the well gases are the mixed gases generated in all the *** is irresponsible to reconstruct the palaeo-temperature and palaeo-pressure under which the gas pool formed using carbon dioxide inclusions.

关键词： Ordos Basin Upper Paleozoic inclusion gas components carbon isotope

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Discrimination of abiogenic and biogenic alkane gases

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Science china Earth Sciences 2008年第12期51卷 1737-1749页

作者： dai jinxing ZOU CaiNeng {2. shuichang li Jian NI YunYan HU GuoYi LUO Xia TAO ShiZhen ZHU GuangYou mi jingkui li ZhiSheng HU AnPing YANG Chun ZHOU QingHua SHUAI YanHua {2. Ying MA ChengHua research institute of {2. exploration and Development Petro ChinaBeijing 100083China Department of Earth Sciences Zhejiang UniversityHangzhou 310027China research institute of {2. exploration and Development(Langfang Branch) PetroChinaLangfang 065007China

We have combined the analytical data of the carbon isotope distribution pattern, R/Ra and CH4/3He values of abiogenic and biogenic (referring to the thermogenic and bacterial or microbial) alkane gases in china with those of alkane gases from USA, Russia, Germany, Australia and other countries. Four discrimination criteria are derived from this comparative study: 1) Carbon isotopic composition is generally greater than -30‰ for abiogenic methane and less than -30‰ for biogenic methane; 2. Abiogenic alkane gases have a carbon isotopic reversal trend (δ 13C1> δ 13C2. δ 13C3> δ 13C4) with δ 13C1>-30‰ in general; 3) Gases with R/Ra >0.5 and δ 13C11 δ 13C2.0 are of abiogenic origin; 4) Gases (meth- ane) with CH4/3He≤106 are of abiogenic origin, whereas gases with CH4/3He≥1011 are of biogenic origin.

关键词： biogenic abiogenic alkane gas discrimination carbon isotope helium isotope

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