鄂尔多斯盆地东北缘临兴—神府致密气田成藏地质特征及勘探突破

doi:10.3969/j.issn.1672-7703.2021.03.005

摘要/Abstract

摘要： 鄂尔多斯盆地东缘晋西挠褶带一直以煤层气勘探为主，由于成藏特征认识不清，致密气勘探鲜有重大突破。2013年，中国海油大胆由煤层气勘探转向致密气勘探，通过系统总结晋西挠褶带北段致密气成藏条件及气藏特征，揭示了其选择性差异富集成藏规律，指出了有利区并获得储量发现。研究结果表明（1）临兴—神府气田产层为石炭系本溪组、二叠系太原组、石盒子组，为典型致密砂岩气藏；（2）煤系地层是主要烃源岩，CH₄平均含量为95%，不含H₂S；（3）气藏埋深为1300～2200m，压力系数为0.85～1.01；（4）储层为大面积分布的三角洲砂岩和障壁沙坝砂岩，前者平均孔隙度为8.8%、渗透率为1.10mD，孔喉半径多小于1.5μm，后者平均孔隙度为7.6%、渗透率为0.59mD，孔喉半径多小于1.1μm；（5）受东部离石走滑断裂带和南部紫金山火山热活动影响，断裂发育具东强西弱、南强北弱的特征，且南部受火山热活动影响，生烃强度高，向北逐渐降低；（6）晚侏罗世生烃后经历3 期构造活动，天然以垂向运聚成藏为主，南部临兴区块以源内、近源、远源立体成藏为主，北部神府区块以源内成藏为主，近源成藏为辅，气藏规模相对较小；（7）创新形成3套勘探关键技术，为致密气的勘探开发提供了技术保障。在以上认识和技术指导下，2021年中国海油在临兴—神府区块探明天然气地质储量1010×10⁸m³，随着自南向北滚动，该区域有可能再次新增千亿立方米储量。

关键词: 鄂尔多斯盆地东北缘, 临兴—神府气田, 致密砂岩气, 气藏富集规律, 关键技术

Abstract: It has been known that CBM exploration is predominant in the Jinxi flexural fold belt in the eastern margin of Ordos Basin.However, due to unclear understanding of gas accumulation, there has been no major breakthrough of tight gas exploration. In 2013, CNOOC made a firm decision to shift from CBM exploration to tight gas exploration. By systematically summarizing the gas accumulation condition and gas reservoir characteristics, the company revealed the differential enrichment law of tight gas, proposed favorable areas and obtained tight gas reserves. The research result suggests that: (1) Pay zones of Linxing-Shenfu Gas Field are mainly in the Carboniferous Benxi Formation and Permian Taiyuan and Shihezi Formations, which are typical tight sandstone gas reservoirs; (2) The main source rocks are coal measure strata, with an average CH4 content of 95% and no H2S; (3) The burial depth of gas reservoir is between 1300-2200 m, and the pressure coefficient ranges from 0.85-1.01; (4) The reservoir consists of widely spread delta sandstone and barrier bar sandstone, of which the former has an average porosity of 8.8%, permeability of 1.10 mD, and pore throat radius less than 1.5 μm, while the latter has an average porosity of 7.6%, permeability of 0.59 mD, and pore throat radius less than 1.1 μm; (5) Influenced by the Lishi strike-slip fault zone in the east and the Zijin Mountain volcanic activities in the south, fault activity is strong in the east and weak in the west, while strong in the south and weak in the north. The hydrocarbon generation intensity is high in the south and gradually decreases towards the north affected by volcanic activities;(6) The study area experienced three periods of tectonic movement after hydrocarbon generating in the Late Jurassic, and the gas reservoir is dominated by vertical migration and accumulation. In Lingxing block, gas reservoir is mainly inside the source, near source and far source accumulation, whereas in Shenfu block it is mainly inside source and supplemented by near source accumulation with smaller scale of gas reservoir; (7) Three sets of key exploration technologies have been developed, which provide solid technical support for tight gas exploration and development. Until 2021, the proven natural gas reserves in Linxing-Shenfu block are 1010×108 m3 guided by above knowledge and technology and another one hundred billion cubic meters of geological reserves could be increased with the progressive exploration from south to north.

Key words: northeastern margin of Ordos Basin, Linxing-Shenfu Gas Field, tight sand gas, gas enrichment law, key technology

中图分类号:

TE122

米立军, 朱光辉. 鄂尔多斯盆地东北缘临兴—神府致密气田成藏地质特征及勘探突破[J]. 中国石油勘探, 2021, 26(3): 53-67.

Mi Lijun, Zhu Guanghui. Geological characteristics and exploration breakthrough in Linxing-Shenfu Tight Gas Field,northeastern Ordos Basin[J]. China Petroleum Exploration, 2021, 26(3): 53-67.

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