摘要
在相同岩性和岩性组合条件下,褶皱前古岩溶发育地段更易产生断裂和裂缝。当古岩溶发育又有超压流体存在时,断层延伸方向将向与构造应力关系不大的方向偏转,因而可以根据断裂与构造的组合关系判断古岩溶是否发育。文章提出了6种与岩溶有关的地质模式;指出岩溶、断裂与有利构造部位三者的组合,是天然气局部富集的主要场所。
During folding, fracture and fault are most Likely formed where in the strata paleokarst hadbeen developed. Fault strike could deviate from tectonic stress in the strata in which developed pale-okarst and filled with high-abnormal pressure fluid. The existence of paleokarst may be distinquisheddepending upon the relationship between fault and structure. 6 kind of models distinquishing paleokarstare established. It is stressed that the local gas accumulation is in the combination area of paleokarst,fault and favourable parts of structure in the Yangxin Limestones in Southern Sichuan.
