Shear fracture direction and mechanical characteristics of the middle Yanchang Formation, southern Ordos Basin, China

Ma, Shuai; Lin, Wei; Wang, Qingchen; Xu, Hui; Wang, Xiangzeng; Zhang, Lixia; Jiang, Chengfu

doi:10.1360/n972016-00469

Cited by 1 publication

(1 citation statement)

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“…Su et al (2017) [26] have utilized production performance analysis and numerical simulation. In addition, 3D seismic data and seismic anisotropy analysis were sometimes combined with imaging logging to orient fractures [27] [28]. Several systematic, comprehensive analysis methods of these data have been undertaken, such as the statistics method [29], rescaled range analysis method [30], and finite difference method [31].…”

Section: Introductionmentioning

confidence: 99%

High-Inclination Coring of Chang-63 of the Yanchang Formation in Huaqing Oilfield, Ordos Basin: Implications for Ancient Flow Direction and Fracture Orientation

Chen¹,

Qü²,

Xie³

et al. 2023

ENG

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A promising method is to use coring of high-inclination well to find ancient flow direction and orient tiny natural fractures in massive sandstone of sandy debris flow. Determination of ancient flow direction can reduce the number of exploration wells, and orientation of natural fractures is of guiding significance to the deployment of water injection development well pattern. In Block X of Huaqing Oilfield, Ordos Basin, the cores of Chang 6 3 section were obtained from Well Y through 16 coring operations, with a total length of 105 m. Cores is oriented through drilling parameters, the number of cores, the angle between the core edge and horizontal bedding, the coincidence degree of core profile and directional flame structure. Therefore, the micro-fractures on the core are directional. The ancient flow directions of sandy debris flow were restored by load casting, groove casting, groove casting and imbricate structure. Our results show that the ancient flow directions of sandy debris flows were southwest, southeast, northwest, and west from bottom to top. The front of the Wuqi Delta is the main source of blocky sandstone with the best oil-bearing property. Affected by the topography of the lake bottom, the sandy debris flow turned locally in the northeast direction, and the sandy debris flow from this direction was formed. The NEE-SWW-trending fractures formed in the Yanshanian period are most developed in the Huaqing area, which should be considered in deploying the flooding well network. The north-south micro-fractures formed in the Himalayan period can improve the physical properties of tight sandstone, which is of great significance for tight sandstone reservoirs.

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