波河罗构造上三叠统普家村组裂缝综合评价

为了预测楚雄盆地波河罗构造油气勘探目标,对该构造上三叠统普家村组裂缝作了系统综合评价,通过野外露头样品点载荷抗张、抗压实验及三轴岩石力学参数测试表明，随着围压增加，不同岩类岩石的抗压强度值增大，抗压强度与弹性模量成正相关关系;随着岩石孔隙度增大，岩石强度降低，更易产生破裂;通过应力场模拟及曲率计算，波河罗构造上三叠统普家村组靠近断裂带及其局部高点裂缝发育，为裂缝发育区；裂缝较发育区围绕局部高点，呈窄环带状分布；其余区域为裂缝不发育区;裂缝发育及较发育区应是今后勘探的优先目标。

COMPREHENSIVE FRACTURE EVALUATION OF PUJIACUN FORMATION OF UPPER TRIASSIC IN BOHELUO STRUCTURE

Boheluo structure is located in Heijing Seg of Chuxiong Basin. It has been superposed for many times and deformed for 5-6 s tages, in which the late Yanshan movement and Himalayan movement were most inten sive, so that it is possessed of the exploration propects for deep gas. Tectonic activity is the external force causing formation to be broken. Through the poin t load tensile and compressive experiments and triaxial rock mechanical tests of outcrop samples, it was shown that, along with the increase in confined pressur e, the rock compressive strength increased and was positively correlated to the elastic modulus; and, along with the increase in rock porosity, the strength dec reased and the rock was easier to be broken. By means of stress field simulation and curvature calculation, it was indicated that, in Pujiacun Formation of Uppe r Triassic in Boheluo structure, the nearby fault zones and local highs are frac ture-developed areas; the fracture-relatively developed areas are round the lo cal highs as narrow annuluses; and all the other places are fracture-undevelope d areas. Obviously, the fracture-developed and-relatively developed areas will be the preferential exploration targets in the future.