在我国陕西南部、重庆、四川、湖北、湖南、贵州等地，有这样一种外部造型独特的灰岩，灰岩表面凹凸不平，呈块状隆起，以四边形、五边形、六边形为主，块体边缘呈现凹槽，凹槽相连形成网状，层面上广泛发育这种多边形的网纹，形如乌龟的背壳。
Abstract:The conductivity of the acid etched fractures is one of the key parameters to evaluate the acid fracturing effect. At present，the experimental research on acid etch of fractures in carbonate reservoirs focuses mainly on limestone reservoirs，and the related research on dolomite reservoirs is rarely reported. The acid-rock reaction characteristics of limestone and dolomite reservoirs are obviously different. In order to study the acid etch morphology and microscopic reaction mechanism of dolomite reservoir fractures，we carried out experimental study on the acid etch conductivity of fractures with the core of dolomite reservoir in a block as the object and comparatively analyzed the micro-morphology of acid etch of limestone and dolomite slates by 3D laser scanning. Through the short-term conductivity experiment，the trend in conductivity of acid etched fractures under the influence of physical properties of the reservoir and acid concentration was analyzed. Compared with limestone，dolomite has a lower surface reaction rate. Moreover，its acid-rock reaction rate is an order of magnitude less than that of limestone. The acid solution of dolomite leads to less etch and its dissolution is mainly along the joint surface. High acid concentration is conducive to the solutions’deep permeation through the acid etched joint surface，so as to connect matrix and fracture. In addition，the acid solution of a high concentration can more fully etch the wall surfaces of acid fractures to improve the non-uniform etch degree and obtain fractures of greater conductivity. Through numerical simulation，it was found that alternating acid injection could effectively improve the non-uniform etch degree of dolomite slates，the conductivity of acid etched fractures，and the acid fracturing effect.
齐鲁网·闪电新闻11月14日讯近日，临沂市通达路旁一在建工地中，一片呈阶梯状排列的壮观岩石受到广泛关注，不少网友猜测这就是传说中的“龟驮城”。为了解开大家的疑惑，山东省地矿局第七地质大队的专家团队来到了现场。
