叠加构造分析及其应用——以贵州赤水地区为例

以叠加构造理论为基础，从区域构造背景出发，根据区内现今构造形迹的特点，运用叠加构造分析的方法，对贵州赤水地区叠加构造特征进行了系统分析。研究认为，该区主要经历了2次主要构造应力作用，构造叠加方式以限制叠加、应力场干扰、断裂切错及褶皱叠加等为主；该区褶皱叠加现象普遍存在，例如太和-旺隆构造由于褶皱叠加作用，在原来简单的长轴构造的基础上，形成了多个近南北向的鼻状构造，产生了新的圈闭（旺北、旺南、五南等）；该区天然气储层以裂缝型为主，在限制叠加、应力场干扰、断裂切错等影响下，岩石容易破碎，裂缝发育，所以叠加强烈部位是下一步勘探的优选目标：如宝元构造与其西侧的高木顶构造相交部位。根据研究成果部署的探井已获得了测试天然气日产量136×10⁴m³。

IMBRICATE STRUCTURE ANALYSIS AND ITS APPLICATION-TAKING CHISHUI REGION IN GUIZHOU AS AN EXAMPLE

Starting from regional tectonic background and according to the features of nowadays structure vestiges, the imbricate structure characteristics in Chishui region, Guizhou are systematically studied by the method of analyzing imbricate structure in light of imbricate structure theory. It is considered that the region mainly underwent 2 tectonic stress actions. The tectonic imbricate patterns mainly are limited imbricate, stress field interference, fracture cross and folded imbricate. Among them folded imbricate, being a common phenomenon, changes the simple folds at early stage into complicated folds. For example, on the basis of original simple major axis structure, Taihe Wanglong structure formed several nose structures near north south direction owing to tectonic imbricate action to produce some new traps as Wangbein trap, Wangnan trap, Wunan trap etc. Moreover, because the gas reservoirs in the region are mainly fractural type, the rocks were broken easy under the influence of limited imbricate, stress field interference, fracture cross etc. and the fractures are developed. So, the violent imbricate locations are the optimal exploration targets at next step. According to research result, 136×104 m3 testing yield is obtained from the exploratory wells in Baoyuan structure and the intersection part of its west side and Gaomuding structure.