Quantitative Characterization of Fractures and Vugs in Carbonate Rocks Based on Rock Surface Resistivity Measurements

doi:10.7657/XJPG20250512

Abstract

Abstract:

The significant heterogeneity of the carbonate reservoirs in the Sinian Dengying formation in the Sichuan Basin poses substantial challenges to interpretation of microresistivity scanning image logging for the fractured-vuggy reservoirs. To enhance the accuracy of imaging logging in evaluating fractured-vuggy carbonate reservoirs, a core surface electric field measurement device was customized based on AutoScan-Ⅱ core planar resistivity scanning experiments. Using this device, experiments on rock surface resistivity measurement and imaging were conducted to quantitatively analyze the imaging response characteristics of vugs and fractures. A calibration method for fracture-vug parameters based on rock surface resistivity distribution was established. The results show that the computed vug diameter and plane porosity increase linearly as the core-measured vug diameter and plane porosity increase, and the computed fracture width and the surface fracture ratio increase logarithmically as the core-measured fracture width and surface fracture ratio increase. The laboratory-based rock surface resistivity experiments effectively reduce the discrepancies between core measurements and imaging logging calculations, enabling precise calibration and quantitative evaluation of plane porosity of fractures and vugs. This study provides a methodological framework for improving the reliability and accuracy of imaging logging in evaluating fractured-vuggy reservoirs, and offers technical support for the evaluation and development of carbonate reservoirs.

Key words: Sichuan Basin, Dengying formation, carbonate rock, rock surface resistivity measurement, imaging logging, fracture-vug, plane porosity

CLC Number:

TE122

LI Mengfan, TANG Jun, ZHENG Chenchang, DU Guohao, WANG Caiwei. Quantitative Characterization of Fractures and Vugs in Carbonate Rocks Based on Rock Surface Resistivity Measurements[J]. Xinjiang Petroleum Geology, 2025, 46(5): 614-621.

Figures/Tables 10

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岩心来源	孔洞直径/mm		面孔率/%
岩心来源	岩心测量	成像计算	岩心测量	成像计算
PT1井	23.98	31.73	5.204	9.531
PT1井	3.10	6.12	1.239	1.329
PS7井	6.76	9.60	5.252	10.760
L1井	3.71	8.42	0.595	2.927
L1井	2.64	6.61	0.358	2.164
L1井	9.36	15.09	3.308	10.271
L1井	10.94	17.86	3.934	13.940
人造岩心	4.08	7.72	1.676	5.554

岩心来源	裂缝宽度/mm		面缝率/%
岩心来源	岩心测量	成像计算	岩心测量	成像计算
PS7井	6.32	12.21	6.687	14.573
L1井	1.43	8.19	1.707	6.213
L1井	1.61	10.02	1.973	8.408
L1井	1.85	7.67	4.149	10.966
L1井	1.54	7.05	2.717	9.730
人造岩心	0.37	2.69	0.742	2.257