菏泽凸起北部兰聊断裂分段特征及其对岩溶热储的控制

基于地震、钻测录井及其他生产测试资料，采用定性分析和定量研究相结合的方式对菏泽凸起北部兰聊断裂生长过程进行反演，并探讨其对岩溶热储的控制作用.研究表明，菏泽凸起北部兰聊断裂在演化过程中呈现三段式结构，具有早期分段-晚期连锁的特征.沙河街组沉积初期，断层分段特征初见雏形；到沙三段沉积期，各个断层分段明显，具有独立正断层位移分布特征；至沙二段—东营组沉积期，各个断层侧向生长最终连接为一条大断裂.断层分段特征的差异性对研究区岩溶热储的空间展布、热传递差异和产能具有重要的控制作用.断层演化过程中，中部2号断裂系总垂直位移相对于南部1号断裂系和北部3号断裂系更大，剖面上为顺向排列的滚动半地堑构造组合样式，菏泽凸起隆升更明显，局部基岩剥蚀严重.该部位岩溶热储具有埋藏浅、岩溶裂缝发育、盖层平均地温梯度高、产能较好的特点，是地热勘探开发的最有利区域.

SEGMENTATION CHARACTERISTICS OF LANLIAO FAULT IN NORTHERN HEZE UPLIFT AND ITS CONTROL ON KARST GEOTHERMAL RESERVOIR

Based on the seismic, drill logging and other production test data, the qualitative analysis and quantitative study are used for inversion of the growth process of Lanliao fault in northern Heze uplift, as well as its control effect on karst geothermal reservoir. The results show that the evolution of Lanliao fault can be divided into three stages, characterized by segmentation in early stage and linkage in late stage. In the early sedimentary stage of Shahejie Formation, the fault segmentation began to appear. Through the depositional stage of Sha-3 Member, each fault segmentation was obvious with the displacement characteristics of independent normal fault. To the depositional stage of Sha-2 Member-Dongying Formation, the fault segmentations grew laterally and eventually connected as a large fault. The difference of fault segmentation characteristics is significant to control the spatial distribution, heat transfer and productivity of karst geothermal reservoir in the study area. During the evolution of the faults, the total vertical displacement of No. 2 fault system in the middle is larger than that of No. 1 fault system in the south and No. 3 fault system in the north, showing a rolling half-graben structure association pattern in a forward arrangement in the profile, and the rise of Heze uplift is more obvious with serious bedrock denudation partially. The karst geothermal reservoir in the area is characterized by shallow burial, developed karst fracture, high average geothermal gradient of cap rock and good productivity, which is the most favorable for geothermal exploration and development.