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Geochemical study on oil-cracked gases and kerogen-cracked gases (Ⅱ)——Discrimination methods between oil-cracked gases and kerogen-cracked gases

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Science China Earth Sciences 2009年第S1期52卷 10-18页

作者： HUANG GuangHui1,2,ZHANG Min1,2,HU GuoYi3 & XIAO ZhongYao4 1 Department of Geochemistry,Yangtze University,Jingzhou 434023,China 2 Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Jingzhou 434023,China 3 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China 4 Tarim Oil Field Branch Company,CNPC,Korle 841000,China

In the processes of discrimination between oil-cracked gases and kerogen-cracked gases,Behar and Pinzgofer et al.'s results were adopted in the former researches,in which the ratio of C2/C3 is basically a constant while the ratio of C1/C2 gradually increases in the course of primary cracking of kerogen. Otherwise in the course of secondary cracking of oil,the ratio of C2/C3 increases rapidly while C1/C2 keeps relatively stable. Our study on analogue experiment shows that,whether it is oil or kerogen,in its process of gas generating by cracking,the ratios of C2/C3,C1/C2 or C1/C3 will all be increased with the growth of thermal conditions. In comparison,the ratio of C2/C3,which is affected by genetic type to some comparatively less extent,mainly responds to the maturity of gases,while the value of C2/C3 is about 2,and that of C2/iC4 is about 10,and the corresponding value of Ro is about 1.5%―1.6%. The influence of gas source on C2/C3 is less than that of gas maturity,otherwise C1/C2(or C1/C3) is obviously affected by cracking matrices. The ratios of C1/C2,C1/C3 of oil-cracked gases are less than that of kerogen-cracked gases,under the condition that the ratios of C2/C3 are similar in value,so are the value of dryness indexes. There exists wide diffidence between this view and the former discrimination method in theory. The analysis of the spot sample indicates that we can apply the above basic view to dealing efficiently with the problem of the discrimination between oil-cracked gas and kerogen-cracked gas.

关键词： Tarim Basin oil-cracked gases kerogen-cracked gases discrimination methods gas composition

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Geochemical features and genesis of the natural gas and bitumen in paleo-oil reservoirs of Nanpanjiang Basin, China

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Science China Earth Sciences 2007年第5期50卷 689-701页

作者： ZHAO MengJun ZHANG ShuiChang ZHAO Lin DA Jiang Research Institute of Exploration and Development PetroChinaBeijing 100083China Guizhou Institute of Petroleum Geology Southern Petroleum Exploration and Development Corp.SinopecGuiyang 550000China

Bitumen from the Nanpanjiang Basin occurs mainly in the Middle Devonian and Upper Permian reef limestone paleo-oil reservoirs and reserves primarily in holes and fractures and secondarily in minor matrix pores and bio-cavities. N2 is the main component of the natural gas and is often associated with pyrobitumen in paleo-oil reservoirs. The present study shows that the bitumen in paleo-oil reservoirs was sourced from the Middle Devonian argillaceous source rock and belongs to pyrobitumen by crude oil cracking under high temperature and pressure. But the natural gas with high content of N2 is neither an oil-cracked gas nor a coal-formed gas generated from the Upper Permian Longtan Formation source rock, instead it is a kerogen-cracked gas generated at the late stage from the Middle Devonian argilla- ceous source rock. The crude oil in paleo-oil reservoirs completely cracked into pyrobitumen and methane gas by the agency of hugely thick Triassic deposits. After that, the abnormal high pressure of methane gas reservoirs was completely destroyed due to the erosion of 2000--4500-m-thick Triassic strata. But the kerogen-cracked gas with normal pressure was preserved under the relatively sealed condition and became the main body of the gas shows.

关键词： source rocks paleo-oil reservoir pyrobitumen kerogen-cracked gas Nanpanjiang Basin

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