牛东地区砂砾岩储层测井层内非均质性评价

doi:10.11720/wtyht.2024.1146

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Abstract

Glutenite reservoirs in the Niudong area exhibit low porosity and permeability, intricate reservoir structures, and pronounced heterogeneity, making it difficult to classify the reservoirs using conventional logs and further impairing reservoir evaluation accuracy. As indicated by the data from core porosity and permeability tests, thin-section analysis, and X-ray diffraction tests, the glutenite reservoirs in the Niudong area feature high heterogeneity and can be classified into three types based on capillary pressure morphologies. This study evaluated the intralayer heterogeneity of the reservoirs using electrical imaging logs. First, reservoir porosity spectra were derived from the electrical imaging logs. Then, the averages, variances, Lorenz coefficients, and concentration functions of the porosity spectra of different depths were calculated by analyzing these depth-varying porosity spectra. Based on the integrated probability model, the weights of evaluation indices were determined through hierarchical analysis, obtaining the composite index of reservoir heterogeneity. Accordingly, the reservoirs were classified, and the evaluation criteria for reservoir heterogeneity were established. The results of this study were consistent with the results of mercury injection experiments. The method used in this study proves effective in reservoir heterogeneity evaluation, enriching current methods for reservoir heterogeneity evaluation and providing theoretical support for fine-scale reservoir evaluation.

Key words： electrical imaging log heterogeneity evaluation mercury injection curve Lorentz coefficient reservoir classification

Received: 10 April 2023 Published: 26 February 2024

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	Articles by authors
	Jun ZHOU
	Hui-Yuan BIAN
	Wen-An CHEN
	Di ZHANG
	Guo-Liang LIU
	Fei WANG

Cite this article:

Jun ZHOU,Hui-Yuan BIAN,Wen-An CHEN, et al. Log-based evaluation of intralayer heterogeneity of glutenite reservoirs in the Niudong area[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 142-150.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1146 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/142

Structural location and lithologic histogram of Jurassic in Niudong Area, Qaidam Basin

Jurassic reservoir lithology

Characteristics of pore types in Jurassic reservoir

Jurassic reservoir porosity and permeability distribution

Morphological structure of porosity spectrum

Porosity spectrum of conglomerate 3340~3370 m from Niu X well in Niudong area

Schematic diagram of Lorentz coefficient calculation

Scale definition of judgment matrix

Paired comparison matrix of parameter weights

Results of Jurassic reservoir non-homogeneity evaluation in Niu X well

Mercury capillary pressure curve of core injection in Niu X well

储层类型	岩性	$孔隙度范围平均值 / %$	$渗透率范围平均值 / 10 - 3 μ m 2$	洛伦兹系数	集中程度函数	综合概率函数	非均质性程度
I	泥质长石岩屑砂岩	$7.9 ~ 9.8 8.3$	$0.3 ~ 0.8 0.6$	≤0.1	≤0.001	≤0.07	弱
Ⅱ	砾质长石岩屑砂岩	$7.1 ~ 8.2 7.5$	$0.28 ~ 0.7 0.42$	0.1~0.15	0.001~0.002	0.07~0.2	一般
Ⅲ	含泥砾不等粒砂岩	$5.3 ~ 7.2 6.6$	$0.04 ~ 0.3 0.2$	>0.15	>0.002	>0.2	强

Classification of reservoir types by comprehensive probability values

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