Petrophysical properties identification and estimation of the Wufeng-Longmaxi shale gas reservoirs: A case study from South-West China

IF 1.6 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Geophysics and Engineering Pub Date : 2023-10-26 DOI:10.1093/jge/gxad088
Or Aimon Brou Koffi Kablan, Tongjun Chen
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Abstract

Abstract Petrophysical properties are critical for shale gas reservoir characterization and simulation. The Wufeng-Longmaxi shale, in the southeastern margin of the Sichuan Basin, is identified as a complex reservoir due to its variability in lithification and geological mechanisms. Thus, determining its characteristics is challenging. Based on wireline logs and pressure data analysis, a shale reservoir was identified, and petrophysical properties were described to obtain parameters to build a reservoir simulation model. The properties include shale volume, sand porosity, net reservoir thickness, total and effective porosities, and water saturation. Total and effective porosities were calculated using density method. Shale volume was estimated by applying Clavier equation to gamma-ray responses. Sand porosity and net reservoir thickness were evaluated using Thomas–Stieber model, and Simandoux equation was used to compute water saturation. The results indicate that the reservoir is characterized by a relatively low porosity and high shale content, with shale unequally distributed in its laminated form (approximately 75%), dispersed (about 20%), and structural form (5%). This research workflow can efficiently evaluate shale reservoir parameters and provide a reliable approach for future reservoir development and fracture identification.
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五峰—龙马溪页岩气储层物性识别与评价——以西南地区为例
岩石物理性质是页岩气储层表征和模拟的关键。四川盆地东南缘五峰组—龙马溪组页岩由于其岩化作用和地质机制的多变性,被认为是一个复杂的储层。因此,确定其特征是具有挑战性的。根据电缆测井和压力数据分析,确定了页岩储层,并对岩石物性进行了描述,获得了建立储层模拟模型的参数。这些属性包括页岩体积、砂岩孔隙度、净储层厚度、总孔隙度和有效孔隙度以及含水饱和度。采用密度法计算总孔隙率和有效孔隙率。利用克拉维尔方程对伽马射线响应进行估算。采用Thomas-Stieber模型评价砂岩孔隙度和净储层厚度,采用Simandoux方程计算含水饱和度。结果表明,储层孔隙度相对较低,页岩含量较高,页岩以层状(约75%)、分散(约20%)、构造(约5%)等不均匀分布。该研究流程可以有效地评价页岩储层参数,为今后的储层开发和裂缝识别提供可靠的方法。
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来源期刊
Journal of Geophysics and Engineering
Journal of Geophysics and Engineering 工程技术-地球化学与地球物理
CiteScore
2.50
自引率
21.40%
发文量
87
审稿时长
4 months
期刊介绍: Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.
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