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如何研究深部岩溶,尤其是深埋地下的古岩溶,这是个新课题。本文介绍了如何利用井径曲线识别溶洞的方法,结合钻井过程中的钻具放空及大量泥浆漏失等项资料,对任丘古潜山碳酸盐岩岩溶进行了研究,初步认为潜山岩溶在纵向上可以分为三个水平溶蚀带,在平面上有南区发育北区差的特点,并对古潜山的变迁与水平溶蚀带的关系作了初步探讨。由碳酸盐岩组成的任丘古潜山深埋地腹三千余米,由于古岩溶作用而产生了大型溶洞。它反映在钻井过程中,往往发生钻具放空和大量的泥浆漏失,井径曲线上常表现为井径扩大。这些大型溶洞,对于碳酸盐岩储集层来说,无论是储集条件和渗透能力,均具有很重要的意义。本文应用75口井的井径曲线,并结合放空漏失及下第三系地层资料,对任丘古潜山碳酸盐岩宏观岩溶发育特征进行了初步研究。
How to study deep karst, especially deep underground karst, this is a new topic. This paper introduces how to use the curve of borehole to identify the karst cave and to study the carbonate rock karst in Renqiu buried hill with the data of drilling tool venting and large amount of mud loss during the drilling process. It can be divided into three horizontal erosion zones longitudinally, with the characteristics of poor northern development in southern area in the plane. The relationship between the evolution of ancient buried hills and horizontal erosion zone is also discussed. Renqiu buried hill made of carbonate rocks buried deep belly more than 3,000 meters, due to the ancient karst and have a large cave. It is reflected in the drilling process, often blowout of the drilling tool and a large number of mud loss, borehole diameter curve often shows the expansion of the borehole. These large caves are of great importance to carbonate reservoirs, both in terms of reservoir conditions and permeability. In this paper, the borehole diameter curve of 75 wells is used, and the macroscopic karst development characteristics of Renqiu buried hill carbonate rocks are preliminarily studied based on the data of the leakages and the Lower Tertiary strata.