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Geochemical characteristics of noble gases in natural gas and their application in tracing natural gas migration in the middle part of the western sichuan depression, China

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Petroleum Science 2013年第3期10卷 327-335页

作者： Wang Peng Shen Zhongmin Liu Sibing Lv Zhengxiang Zhu Tong Gong Yajun State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Geology Scientific Research Institute of Shengli Oilfield Branch Company SINOPEC

Noble gases in natural gas, from Xiaoquan, Xinchang, Hexingchang and Fenggu gas reservoirs in the middle part of the western sichuan depression, China, were analysed. Results show that the volume content of crustal noble gases accounts for 97.9% to 99.7% of the total noble gas content, indicating that the noble gases in the study area are very largely derived from the crust. Moreover, the 40Ar time-accumulating effect of source rocks is used to determine the complex relationship between gases and source rocks in this area, and the results agree well with that from analysis of source rock light hydrocarbons. Due to the short migration distance, the separation of 4He and 40Ar is not significant in Xujiahe natural gas and Lower and Middle Jurassic natural gas, so it is difficult to trace natural gas migration. However, this separation characteristic of 4He and 40Ar in Middle and Upper Jurassic natural gas is significant, which indicates that natural gas migration was from the Middle Jurassic to Upper Jurassic formations. In addition, the variation trends of 3He/4He ratio and δ13C1 value indicates that natural gas migration is from the Xujiahe formation to the Jurassic layer in the study area.

关键词： western sichuan depression noble gas He and Ar isotopes natural gas migration

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Genesis of the low-permeability reservoir bed of upper Triassic Xujiahe Formation in Xinchang gas field,western sichuan depression

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Petroleum Science 2008年第3期5卷 230-237页

作者： Xu Zhangyou Zhang Xiaoyu Wu Shenghe Zhao Yan School of Resources and Information Technology China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China

The genesis of a reservoir is a result of the combined action of deposition, diagenesis, tectonic reworking, and interaction of rock and fluid and the evolutionary environment. We discuss the genetic and evolution mechanism of a low-permeability reservoir bed of the Xujiahe Formation in the western sichuan depression on the basis of the study of diagenesis, diagenetic reservoir facies and the diagenetic evolution sequence. The research indicated that this reservoir bed can be divided into five types of diagenetic reservoir facies, namely strong dissolution, chlorite-lined intergranular pores, compaction and pressure solution, carbonate cementation and secondary quartz increase. There are, however, just two diagenetic reservoir facies which provide low-permeability reservoir beds, namely strong dissolution and chlorite-lined intergranular pores. We also analyzed their diagenetic evolution sequences and the origin of the low-permeability reservoir bed. Besides, it was also indicated that the composition and structure of sandstones, types of sedimentary microfacies, diagenesis history as well as the tectonic reworking in later periods are the main factors controlling the formation of the low-permeability reservoir bed. The above- mentioned factors establish the foundation for the forecasting the distribution of high quality reservoir beds.

关键词： Low-permeability reservoir diagenetic reservoir facies Xujiahe Formation upper Triassic Xinchang gas field western sichuan depression

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Hydrocarbon Generation and Expulsion of the Upper Triassic T3x5Source Rocks in the western sichuan depression: Assessment for Unconventional Natural Gas

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 175-186页

作者： GUO Yingchun SONG Yan PANG Xiongqi WANG Youwei YANG Keming LI Boyuan State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Institute of Unconventional Natural Gas China University of Petroleum Research Institute of Petroleum Exploration and Development PetroChina Southwest Branch Company China Petroleum and Chemical Corporation

Tight-sand gas in the Jurassic and shale gas within the fifth member of Xujiahe Formation （T3xs） in the western sichuan Basin （WSD） are currently regarded as the most prolific emerging unconventional gas plays in China. This study conducted a conventional evaluation of T3x5 source rocks in the WSD, and investigated their hydrocarbon generation and expulsion characteristics, including intensity, efficiency and amount. The results show that, the T3x5 source rocks are thick （generally 〉200 m）, and have a high total organic content （TOC）, ranging from 2.5 to 4.5 wt%. It is thus indivative of a great hydrocarbon generation potential when they underwent high thermal evolution （Ro〉1.2%） in the area. In addition, an improved method of hydrocarbon generation potential is applied, indicating that the source rocks reached a hydrocarbon expulsion threshold with vitrinite reflectance （Ro） reaching 1.06%. and that the comprehensive hydrocarbon expulsion efficiency is about 60%. The amount of hydrocarbon generation and expulsion from Tax5 source rocks is 3.14x10^10 t and 1.86x10^10 t, respectively, with a residual amount of 1.28x10^10t within them. Continuous-type tight-sand gas is predicted to have developed in the Jurassic in the Chengdu Sag of the WSD because of the good source-reservoir configuration; the Jurassic sandstone reservoirs are tight, and the gas expelled from the T3xs source rocks migrates for very short distances vertically and horizontally. The amount of gas accumulation in the Jurassic reservoirs derived from T3x5 source rocks is up to 9.3x10s t. Geological resources of shale gas are up to 1.05x10TM t. Small differences between the amounts calculated by the volumetric method and those obtained by hydrocarbon generation potential method may be due to other gas accumulations present within interbedded sands associated with gas shales.

关键词： source rocks evaluation hydrocarbon generation and expulsion tight-sand gas shale gas,resource assessment Upper Triassic western sichuan depression

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