Geochemical characteristics,forming conditions and resource evaluation of oil-cracking gas as exemplified by the platform area of the Tarim Basin |
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| Authors: | Min Zhang Xiaohui Chen Guanghui Huang |
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| Institution: | ZHANG Min1,2*,CHEN Xiaohui1,2,and HUANG Guanghui1,2 1 Department of Geochemistry,Yangtze University,Jingzhou 434023,China 2 The Key Laboratory of Exploration Technology for Oil & Gas Resources,Ministry of Education,China |
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| Abstract: | Based on the geochemical characteristics of oil-cracking gas and kerogen-cracking gas revealed by simulation experiments and
the chemical composition of natural gases in actual gas reservoirs, two kinds of natural gases with different relationships
between C2/C3 and C1/C2, C2/C3 and C1/C3, C2/C3 and 100×C1/(C1–C5) were identified in the Tarim Basin, and proposed further by the authors. The relationship charts of C2/C3 and C1/C2, C2/C3 and C1/C3, C2/C3 and 100×C1/(C1–C5) can be used to effectively distinguish oil-cracking gas from kerogen-cracking gas. Petroleum geological analysis of the
oil-cracking gas reservoirs showed that the distribution of oil-cracking gas is mostly related with deep-seated faults or
faults with a large fault throw, and the burial depth of paleo-oil reservoir is relatively high; crude oil-cracking gas resources
have been evaluated by using both forward and inversion methods. The plots of C2/C3 vs. C1/C2, C2/C3 vs. C1/C3, and C2/C3 vs. 100×C1/(C1–C5) were used to distinguish between oil-cracking gas and kerogen-cracking gas, and estimate the mixed ratios of the two kinds
of natural gases in the main gas reservoirs of the platform area. |
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| Keywords: | oil-cracking gas identification mark forming condition resource evaluation Tarim Basin |
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