鄂尔多斯盆地石炭系-二叠系煤系非常规天然气勘探开发进展与攻关方向

doi:10.11743/ogg20220501

Abstract

Abstract:

With the development and breakthroughs made in sweet spot assessment of unconventional gas， multi-stage hydraulic fracturing in horizontal wells， and simultaneous development of multiple pay zones， the exploration and development paradigm of unconventional gas has shifted from single mode to composite mode. The joint exploration and commingled production of unconventional gases from coal measure strata of marine-to-continental transitional facies is expected to become a new “unconventional revolution” following the shale revolution. The Carboniferous-Permian is of the most important source rock sequences in the Ordos Basin， featuring huge potential in unconventional gas resources， though at the initial stages of exploration and development. Based on exploration progresses made and research results achieved during the 13th Five-Year Plan period， we summarize the geological features of the Carboniferous-Permian coal-measure unconventional gas in the Ordos Basin， that is， “two sources， three highs， and three gases”. The Carboniferous-Permian is dominated by multiple types of lithology or lithological components， and the coal-rich components（“two sources”） are major targets in exploration，among others. The organic macerals of the source rocks are dominated by vitrinite， and organic pores and micro-fractures are the main reservoir spaces， characterized by high total organic carbon content， high thermal maturity， and high gas content （“three highs”）. The gas occurrence is markedly differentiated between deep and shallow layers， with adsorbed gases dominating the shallow coal seams， and free gases occurring in the deep coal seams， resulting in the coexistence of coalbed methane， shale gas and tight sand gas （“three gases”）， and the existence of their various combinations. Regarding challenges such as tightness of reservoirs， large difficulty in sweet spot identification， and relatively high stresses， we have developed drilling and completion technique of “long lateral， large pumping rate， large liquid volume and high sand load”， which could be of effective supports to breakthroughs made in unconventional gas exploration in deep coal-measure reservoirs. It is suggested to further strengthen the comprehensive research on coal-measure source rocks and lithological assemblages， establish theory and technology for integrated evaluation of geological and engineering sweet spots， and develop supporting technologies in exploration， development， and engineering， in an effort to accelerate high-quality development of unconventional gas in the Ordos Basin during the 14th Five-Year Plan period.

Key words: lithological assemblage, gas-bearing potential, unconventional natural gas, Carboniferous, Permian, Ordos Basin

CLC Number:

TE132.2

Xusheng Guo, Dehua Zhou, Peirong Zhao, Zengqin Liu, Dianwei Zhang, Dongjun Feng, Fengcun Xing, Wei Du, Gang Chen, Fan Yang, Chuanxiang Sun. Progresses and directions of unconventional natural gas exploration and development in the Carboniferous-Permian coal measure strata， Ordos Basin[J]. Oil & Gas Geology, 2022, 43(5): 1013-1023.

Figures/Tables 8

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非常规气类型	主要评价参数
煤层气	埋深、煤阶、煤层厚度、含气量、渗透率、地下水矿化度
页岩气	TOC、R_o、优质页岩厚度、孔隙度、含气量、压力系数、顶底板岩性、构造复杂程度
致密砂岩气	砂岩厚度、孔隙度、渗透率、含气饱和度

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Progresses and directions of unconventional natural gas exploration and development in the Carboniferous-Permian coal measure strata， Ordos Basin

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