南华北盆地海陆过渡相页岩特征及勘探层位优选——以通许地区上古生界为例

doi:10.13809/j.cnki.cn32-1825/te.2022.04.018

摘要/Abstract

摘要：

牟页1井和郑东页2井太原组泥页岩试气突破,证实了南华北区域上古生界海陆过渡相页岩气具深挖资源潜力。结合通许3井、通许4井最新资料,综合分析南华北盆地通许地区上古生界太原组与山西组泥页岩地球化学、岩石学、储集空间、物性特征以及含气性等,结果表明：①太原组与山西组泥页岩有机质来源于高等植物,属Ⅲ型干酪根;TOC（总有机碳）值介于1.0 %~4.5 %,属于好的烃源岩;R_o（镜质体反射率）值为2.4 %~3.4 %,处于过成熟阶段;泥页岩储层脆性矿物含量较高,有利于后期压裂改造。②储集空间以裂缝和微裂缝为主,无机孔次之,有机质孔发育较少,且呈孤立状分布;整体孔渗值较低,微裂缝对渗透率有明显改善作用。③综合对比已有试气成果及页岩气评价参数,太原组页岩气资源潜力明显优于山西组,是南华北盆地海陆过渡相页岩气勘探研究的重点层位。

关键词: 页岩气, 上古生界, 海陆过渡相, 通许地区, 南华北盆地

Abstract:

The gas test breakthrough of mudstone shale of Taiyuan Formation in Well-MY1 and Well-ZDY2 has proved that the Upper Paleozoic marine-continental transitional shale gas in the South of North China Basin has potential for further tapping resources. Based on the latest data of Well-TX3 and Well-TX4, this paper comprehensively analyzes the shale geochemistry, petrology, reservoir space, physical properties and gas bearing properties of the Taiyuan Formation and Shanxi Formation of the Upper Paleozoic in Tongxu area in the South of North China Basin, the results show that: ① The organic matter of the mud shales of the Taiyuan and Shanxi Formations comes from the vascular plant and belongs to type Ⅲ Kerogen; TOC value is 1.0 %~4.5 % and belongs to good source rock; R_o value is 2.4 %~3.4 % and is in the over mature stage. The mud shale reservoir has higher brittle mineral content, which is favorable for the later fracturing reconstruction. ②The reservoir space is dominated by fractures and micro-fractures, followed by inorganic pores, less developed organic pores and isolated distribution. ③Based on the comparison of the gas test results and shale gas evaluation parameters, the shale gas resource potential of Taiyuan Formation is obviously better than that of Shanxi Formation.

Key words: shale gas, Upper Paleozoic, marine-terrestrial transitional facies, Tongxu region, the South of North China Basin

中图分类号:

TE132

陈倩倩. 南华北盆地海陆过渡相页岩特征及勘探层位优选——以通许地区上古生界为例[J]. 油气藏评价与开发, 2022, 12(4): 690-697.

Qianqian CHEN. Characteristics and exploration horizon optimization of marine-continental transitional shale in the South of North China Basin: A case study of Upper Paleozoic in Tongxu area[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(4): 690-697.

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