四川盆地合川地区栖霞组-茅口组白云岩储层微观表征
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TE122.2+3

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中国石油天然气集团有限公司上游领域基础性前瞻性项目(编号:2021DJ0501)


Microscopic characterization of dolomite reservoir of Qixia-Maokou Formation in Hechuan area, Sichuan Basin
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    摘要:

    近年,合川地区栖霞组—茅口组钻获多口高产工业气流井,表明其具有良好的勘探前景。然而该地区整体勘探程度较低,储层特征及成因仍不明确,导致储层评价、预测难。研究基于潼深4井、合深6井等8口钻井的资料,开展了岩芯、薄片、成像测井及孔渗数据的储层特征分析,并优选样品开展了基于氩离子抛光扫描电镜及工业CT的储层孔喉结构微观表征。取得三方面认识:四川盆地合川地区栖霞组—茅口组主要发育晶粒白云岩、含灰白云岩、灰质云岩三种类型,晶粒白云岩为最主要的储层岩性也是主要的储集空间载体。栖霞组白云岩储层以相对均匀发育的基质孔为主,整体具有中高孔、中渗的特征;茅口组白云岩储层主要以非均质分布的溶蚀孔洞和溶缝为主,也存在一定量的基质孔,整体具有中高孔、中高渗特征。基于工业CT的储层微观表征揭示栖霞组晶间(溶)孔分布相对均匀,而茅口组白云岩则非均质性强,晶间(溶)孔分布与裂缝无关,反映这些孔隙为早期孔隙的继承;基于扫描电镜的储层微观表征揭示栖霞组—茅口组都存在与晶体缺陷相关的微孔隙,表明除溶蚀孔洞外,晶间(溶)孔与微孔隙对储层物性同样具有重要贡献。研究结果有效指导了合川地区栖霞组—茅口组白云岩储层评价。

    Abstract:

    In recent years, multiple high-yield economically viable gas flow wells have been drilled in the Qixia Maokou Formation in the Hechuan area, indicating its promising exploration. However, overall exploration in the area still at a low level, and the reservoir characteristics and genesis not been understood, leading to difficulties reservoir evaluation and prediction. Reservoir characteristics analysis was conducted by core samples, thin sections, imaging, and porosity-permeability data, samples were selected for tests of the SEM with Ar-ion Milling and industrial CT. Obtaining three aspects of understanding: The Qixia Formation-Maokou Formation dolomite in the Hechuan area of the Sichuan Basin is mainly developed in three types: crystalline dolomite, dolomite with lime and calcareous dolomite, of which crystalline dolomite is the most important reservoir lithology and the main reservoir space carrier. The dolomite reservoir of the Qixia Formation is dominated by intercrystal pores, which are relatively uniformly developed and have the overall characteristics of medium to high porosity and medium permeability. The dolomite of the Maokou Formation is mainly dominated by vugs and dissolution fractures, there is also a certain amount of heterogeneous distribution of intercrystal pores, with an overall medium-high porosity and medium-high permeability character. Reservoir microscopic characterisation based on industrial CT reveals that intercrystal pores are relatively homogeneous in the Qixia Formation dolomites, whereas the Maokou Formation dolomites are strongly heterogeneous, and both develop independently of fractures, reflecting that these pores are the inheritance of earlier pores; Reservoir microscopic characterisation based on SEM with Ar-ion Milling reveals that micro-pores associated with crystal defects exist in both the Qixia and Maokou Formations, it suggests that in addition to vugs, intercrystal pores and micro pores also significant contributions to the reservoir properties. The research results effectively guide the evaluation of dolomite reservoirs in the Qixia Maokou Formation in the Hechuan area.

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代坤,郑剑锋,白雪晶. 四川盆地合川地区栖霞组-茅口组白云岩储层微观表征[J]. 科学技术与工程, 2024, 24(28): 12003-12015.
Dai Kun, Zheng Jianfeng, Bai Xuejing. Microscopic characterization of dolomite reservoir of Qixia-Maokou Formation in Hechuan area, Sichuan Basin[J]. Science Technology and Engineering,2024,24(28):12003-12015.

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  • 收稿日期:2023-08-24
  • 最后修改日期:2024-07-11
  • 录用日期:2024-02-20
  • 在线发布日期: 2024-11-05
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