渤海海域古近系—新近系裂缝性漏失断缝体系特征及力学机理研究

doi:10.3969/j.issn.1672-7703.2023.05.007

摘要/Abstract

摘要： 随着渤海油田勘探开发深入，复杂断块构造、火成岩发育区及深层—超深层逐渐成为主要勘探目标区，古近系—新近系井漏概率日趋增大，井漏已成为制约渤海油田增储上产作业的主要钻井地质风险。长期以来，由于对渤海古近系—新近系裂缝性漏失地质规律和力学机制认识不足，导致井漏预防和处理缺乏有效技术支撑。基于此，在系统梳理井漏主控因素和机制基础上，综合钻井、地质、地震及露头资料，运用井—震联合统计分析和地质力学建模方法理清了渤海油田古近系—新近系裂缝性漏失断缝体系特征及力学机理，研究表明：（1）地层裂缝性漏失与郯庐断裂带密切相关，“Y”形断层交叉点及多级“Y”形断层组成的负花状构造的花心、平面“X”形复合断裂、高角度断层等是易漏构造；火成岩区地层产状突变部位、火山通道内部等为井漏高风险区；（2）厚泥薄砂互层，厚层泥岩应变量大，应力多集中于薄层砂岩，一般裂缝较为发育，井漏风险最大；（3）基于应力场有限元模拟理清火山通道周缘应力场分布特征，结合实钻厘定火山通道及周缘100m为井漏高风险区。

关键词: 渤海, 古近系—新近系;裂缝性漏失, 断缝体系;力学机理；防漏对策

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.

中图分类号:

TE132.1

邓津辉, 谭忠健, 袁亚东, 张向前, 彭超. 渤海海域古近系—新近系裂缝性漏失断缝体系特征及力学机理研究[J]. 中国石油勘探, 2023, 28(5): 84-98.

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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