东营凹陷北部陡坡带现今断层应力FLAC 计算研究FLAC computation.PDF

东营凹陷北部陡坡带现今断层应力FLAC 计算研究 1 2 吴李泉 ，曹代勇 （1．浙江科技学院建筑工程学院，浙江杭州310023；2．中国矿业大学（北京）地球科学与测绘工程学院，北京100083） 摘要：在含油气盆地构造分析中，现今断层应力性质的定量化判断研究是油气勘探和开发过程中断层封闭性研究 的重点和难点之一。以东营凹陷北部陡坡带为研究实例，利用 FLAC 计算作为手段，基于现今构造应力场作用条 件下，通过定量计算研究区内不同倾角断层及其周遍区域的应力分布特征及其随深度变化情况，本文定量化演示 了研究区内的断层在现今构造应力场作用下的应力分布特性及其随深度变化趋势。研究结果显示，断层的应力特 性可以定量化描述，断层在不同深度的应力性质状态是变化的。断层性质随深度变化的原因是构造应力场与地层 重力场随深度变化引起的。本文为断层封闭的断层力学特性定量化研究提出了有效研究途径，研究结论可以为断 层封闭性定量化研究提供重要的判别依据。 FLAC computation of fault property under the present tectonic stress field, North Zone of Dongying Basin 1 2 L. Wu D. Cao (1.Zhjiang University of Science and Technology, Hangzhou Zhejiang 310023, China; 2. College of Geoscience Surveying Engineering, China University ofMining Technology, Beijing 100083） Abstract: The quantitative understanding of the current stress state, which refers to correlation among the three principal stresses, along a fault is one of the challenging and interesting aspects in the study of fault permeability. This study is commonly conducted to help identify the possible existence of oil and gas resources for the given geological conditions during reservoir exploration and development. Taking the North Zone of Dongying Basin as an example, this paper introduces the numerical exercises with FLAC to help understand the stress distributions at different depths along the faults that are present with various dips within this domain of interest. The modeling results indicate that the stress state along a fault can be quantitatively described, and it varies with depth along the fault. The variation of stress state is es