Study on characteristics and mechanical mechanism of fracture leakage fault-fracture system in the Paleogene-Neogene in Bohai Sea area

doi:10.3969/j.issn.1672-7703.2023.05.007

Abstract

Abstract: With the deepening of exploration and development in Bohai Oilfield, complex fault block structures, igneous rock areas and deep-ultra deep formations have gradually grown to be the main exploration targets, and the probability of lost circulation in the Paleogene-Neogene is increasing, which is the main geological risk in drilling that restricts the increase of reserves and production in Bohai Oilfield. Due to the insufficient understanding of geological laws and mechanics mechanism of fractured leakage in the Paleogene-Neogene in Bohai Sea area, there is a lack of effective technical support for the prevention and treatment of lost circulation. Therefore, based on the systematic summary of the main controlling factors and mechanisms of lost circulation, the comprehensive well drilling, geological, seismic and outcrop data are used, and well seismic integrated statistical analysis and geomechanical modeling methods are applied to identify the characteristics and mechanical mechanism of fracture leakage fault-fracture systems in the Paleogene-Neogene in Bohai Oilfield. The study results show: (1) The fractured leakage is closely related to Tanlu Fault Belt. The flower centers of negative flower-shape structure composed of intersections of “Y” shaped faults and multi-level “Y” shaped faults, “X” shaped composite faults on the plane and high angle faults are prone to leakage. The igneous rock areas with mutation in the formation occurrence and the interior of volcanic conduit have high risks of lost circulation; (2) In the interbedding of thick mudstone and thin sandstone, there is a high strain in the thick mudstone, and the stress is mostly concentrated in thin sandstone, generally with fractures well developed, so the risk of lost circulation is the highest; (3) Based on the finite element simulation of stress field, the distribution characteristics of stress field around the volcanic conduits are clarified, and it is determined that there is a high risk of lost circulation in areas in volcanic conduits and 100 m around combined with actual drilling data.

CLC Number:

TE132.1

Deng Jinhui, Tan Zhongjian, Yuan Yadong, Zhang Xiangqian, Peng Chao. Study on characteristics and mechanical mechanism of fracture leakage fault-fracture system in the Paleogene-Neogene in Bohai Sea area[J]. China Petroleum Exploration, 2023, 28(5): 84-98.

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