新疆柯坪-巴楚地区碳酸盐岩构造裂缝发育的控制因素及油气勘探意义

构造裂缝发育程度是碳酸盐岩地区构造裂缝定量研究的重要方面,对碳酸盐岩裂缝油气藏的储层预测具有重要意义。论文基于野外地质实际考察,研究岩性、地层厚度、构造性质等因素对构造裂缝的影响,建立比较系统的构造裂缝发育分布规律,建立构造裂缝发育的地质模型。白云岩的裂缝密度明显大于灰岩类的裂缝密度。地层越厚裂缝密度越小,但裂缝规模较大。走滑断裂控制的构造裂缝的裂缝密度与距断裂的距离呈指数关系且存在"断裂控制的裂缝带","断裂控制裂缝带"与断裂的性质、规模和断距等因素密切相关。提出不同性质断裂"断裂控制裂缝带"宽度与断层破碎带宽度的比值K,这个比值的发现对断裂控制的裂缝油气勘探开发具有重要的应用价值。

The Controlling Factor Study of Development of Carbonatic Rock Fractures in the Kelpin Bachu Area, Xinjiang and Its Petroleum Exploration Significance

The development degree of fractures is an important aspect of quantitative study on structural fractures in the carbonatic rock area, and is if great important to reservoir prediction of fractured carbonate oil and gas reservoir. Based on the field geological work, the development and distribution of fractures were discussed in terms of lithology, rock bed thickness and structure types. The geological model was proposed according to the different factors controlling the fracture development. The results show that dolomite is subject to produce structural fractures in the same tectonic setting. The thicker the layer, the smaller the fracture density, and the bigger the scale of fractures. The fracture density controlled by strike slip fault decreases exponentially with increase of the distance, resulting in the formation of so called fault controlling fracture zones. The fault controlling fracture zones are closely related to nature, scale and offsetting distance of the faulting. The ratio (K) of fracture zone width to fault fracture zone is an important parameter for the prediction of fracture zone controlled by fault.