Differences in Natural Fracture Development in Ultra-Deep Carbonate Reservoirs: A Case Study of YUEM Area in Tarim Basin

doi:10.7657/XJPG20250203

Abstract

Abstract:

The carbonate reservoirs in the YUEM area of Tarim Basin show differences in natural fracture development. Using the data of outcrop, core, thin section, logging, seismic, and production performance, the differences of natural fractures in development characteristics, formation periods, genesis, and spatial distribution were clarified through fracture parameter statistics, sensitivity analysis of seismic attributes, and numerical simulation of tectonic stress field. Three types of fractures, i.e. diagenetic fractures, tectonic fractures, and composite fractures, corresponding to three development periods are found in the study area. The development of these fractures is controlled by the coupling of tectonics, sedimentation, and karstification. Favorable fracture development zones are identified in oblique-overlap zones, intersections of major and secondary faults, fault tips, algal reef facies belts, and tops and bottoms of karst caves.

Key words: Tarim Basin, carbonate rock, natural fracture, difference, tectonics, sedimentation, karstification

CLC Number:

TE122.2

LI Hui, NING Yaxin. Differences in Natural Fracture Development in Ultra-Deep Carbonate Reservoirs: A Case Study of YUEM Area in Tarim Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 144-153.

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与断层面距离/m	油井数/ 口	初期平均日产油量/t	初期日产油量大于30 t井占比/%	平均单井累计产油量/10⁴ t
<1 000	129	60.5	89	1.85
>1 000	72	41.1	11	0.84

井名	裂缝发育分区	累计产油量 /10⁴ t	累计产气量 /10⁸ m³
YUEM2-1井	裂缝密集发育区	10.70	0.46
YUEM5井	裂缝密集发育区	13.57	0.70
YUEM5-5井	裂缝密集发育区	9.68	0.47
YUEM6井	裂缝有利发育区	3.54	0.22
YUEM5-1井	裂缝有利发育区	5.94	0.25
YUEM2井	裂缝较发育区	1.61	0.01