Petroleum Exploration and Development >

2017 , Vol. 44 >Issue 4: 503 - 512

DOI: https://doi.org/10.11698/PED.2017.04.03

PETROLEUM EXPLORATION

New indexes and charts for genesis identification of multiple natural gases

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  • 1. Gas Geology Research Center of PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China;
    2. Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, China;
    3. Information Center of PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Revised date: 2016-07-08

  Online published: 2017-07-27

Supported by

国家科技重大专项（2016ZX05007-003, 2011ZX05007-002）; 中国石油天然气股份有限公司重大专项（2016B-0601, 2014B-0608）

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Abstract

Identification of natural gas genesis and source for high-matured multiple natural gases is a great challenge in the exploration of deep-ultra deep and unconventional natural gases. In this paper, the genesis identification method system of multiple natural gases is enriched through new experimental techniques and comprehensive analysis of geological data. New indexes and charts of genesis identification for multiple natural gases were determined to distinguish the sapropelic kerogen degraded gas and crude oil cracking gas, accumulated and scattered liquid hydrocarbon cracking gas in different evolution stages, nitrogen, carbon dioxide of organic and inorganic origins, inert gases of crustal and mantled origins, coal-formed gas and oil-type gas by helium, nitrogen, carbon dioxide and mercury content in natural gas. These indexes and charts have been successfully applied in the Sichuan, Tarim and Songliao basins to identify the natural gas genesis and source for complicated gas reservoirs. The research results have provided effective support for the natural gas exploration in the Sinian-Cambrian ancient carbonate formations in the Sichuan Basin, deep formations in the Kuqa depression of the Tarim Basin, and deep volcanic formations in the Songliao Basin.

Key words： multiple natural gases; genesis identification; cracking gas; nitrogen; carbon dioxide; inert gas; mercury content

Cite this article

LI Jian1, 2, LI Zhisheng1, 2, WANG Xiaobo1, 2, WANG Dongliang3, XIE Zengye1, 2, LI Jin1, 2, WANG Yifeng1, 2, HAN Zhongxi1, 2, MA Chenghua1, 2, WANG Zhihong1, 2, CUI Huiying1, 2, WANG Rong1, 2, HAO Aisheng1, 2 . New indexes and charts for genesis identification of multiple natural gases[J]. Petroleum Exploration and Development, 2017 , 44(4) : 503 -512 . DOI: 10.11698/PED.2017.04.03

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