| 鄂尔多斯盆地苏里格气田西南部致密储层非均质性特征及对成藏的制约 |
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| 引用本文： | 崔明明,李进步,李莹,李义军.鄂尔多斯盆地苏里格气田西南部致密储层非均质性特征及对成藏的制约[J].地质学报,2024,98(1):214-230. |
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| 作者姓名： | 崔明明 李进步 李莹 李义军 |
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| 作者单位： | 中国地质科学院地质研究所，北京，100037;低渗透油气田勘探开发国家工程实验室，中国石油长庆油田分公司勘探开发研究院，陕西西安，710018 |
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| 基金项目： | 本文为中国地质科学院地质研究所科研结余经费项目(编号 S2008)资助的成果 |
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| 摘 要： | 致密砂岩气藏是我国非常规油气资源的重要组成，其储层非均质性严重影响了致密气成藏和甜点区优选，进而制约了气田高效开发。为进一步揭示储层非均质性成因及对致密气成藏的影响，选取鄂尔多斯盆地苏里格气田西南部山1段和盒8段致密储层为例，通过岩芯观察、扫描电镜、薄片鉴定、生产和测井分析等技术手段，研究储层非均质特征，探讨沉积作用和微观孔隙演化对非均质性和成藏的影响。结果表明，储层非均质性多表现为层内粒度的垂向韵律性、夹层的不均匀分布、渗透率的平面分布差异等；储层非均质性受沉积作用和成岩作用共同影响，沉积作用控制了水动力条件、砂体展布、厚度和砂体构型，储层微观非均质性受岩矿组构和孔隙演化影响；不同厚度和构型的复合砂体，多样的矿物组分、孔隙结构，致密气的选择性充注，共同造成了苏里格地区致密储层的非均质性及含气性差异。复合砂体的高孔渗部位是致密气开采的甜点区，但是在优选有利区时不应只关注这些厚层的高孔渗砂体，也应关注规模小、非均质性稍强的透镜状砂体，需要充分考虑到储层非均质性对致密气成藏的影响。
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| 关 键 词： | 苏里格气田 非均质性 砂体构型 复合砂体 有利区优选 |
| 收稿时间： | 2022/5/23 0:00:00 |
| 修稿时间： | 2022/6/8 0:00:00 |
Heterogeneity characteristics and its constraints on accumulation of tightsandstone reservoirs in the southwestern Sulige gas field, Ordos basin |
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| CUI Mingming,LI Jinbu,LI Ying,LI Yijun.Heterogeneity characteristics and its constraints on accumulation of tightsandstone reservoirs in the southwestern Sulige gas field, Ordos basin[J].Acta Geologica Sinica,2024,98(1):214-230. |
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| Authors: | CUI Mingming LI Jinbu LI Ying LI Yijun |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;National Engineering Laboratory for Exploration and Development for Low- Permeability Oil & Gas Fields, Research Institute of Exploration and Development, PetroChina Changqing Oilfield Co |
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| Abstract: | Tight sandstone gas reservoirs are important component of unconventional oil and gas resources in China. Tight gas accumulation and key target optimization are affected by reservoir heterogeneity, which in turn restricts the efficient development of gas field. This study aims to investigate the characteristics and formation of reservoir heterogeneity. Taking reservoirs of the 1st Member of Shanxi Formation and the 8th Member of Shihezi Formation in the southwestern Sulige gas field as examples, based on core analysis, scanning electron microscopy analysis, thin section identification, production data, and logging data analysis, the heterogeneity characteristics and gas- water distribution are analyzed, and the influences of sedimentation and microscopic pore evolution on tight gas reservoir are discussed. The results show that reservoirs in southwestern Sulige gas field have strong heterogeneity. Heterogeneity is mainly manifested by vertical rhythm of grain size, uneven distribution of interlayer, and permeability differences in reservoir. Heterogeneity is also influenced by sedimentation and diagenesis. Sedimentation controls the hydrodynamic condition, distribution, thickness and superimposition patterns of sand bodies. Microscopic heterogeneity is influenced by sandstone composition and pore evolution. The heterogeneity and gas- bearing distribution of tight reservoirs in the Sulige area are controlled by the composite sand body with different thickness and superimposition patterns, the sandstone composition, pore- throat structure, and the selective charging of tight gas. The high porosity and permeability of the composite sand body is the sweet spot of tight gas. However, attention should not only be paid to the thick sand body with high porosity and permeability, but also to the small- scaled lenticular sand body with strong heterogeneity when optimizing target area. The influence of reservoir heterogeneity on gas- water distribution and hydrocarbon accumulation should be fully considered in tight gas production. |
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| Keywords: | Sulige gas field heterogeneity sand body superimposition composite sand body target area optimization |
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