In recent years,the field of carbonate rocks of Tarim basin has gained rich oil and gas,especially Ordovician karst cave reservoir resource in deep seam of northern basin.For the purpose of accurate cognition,evaluation and management of the reservoirs,the application of geophysical exploration methods to fine characterization of reservoir and accurate quantitative description of production and reserves is very important.Previous quantitative description of reservoir and karst seam holes is mainly based on two-dimensional (plane) category.In this paper,the authors introduce the key description method based on high precision acquisition of 3D seismic data,drilling data and production performance data,activity union,properties characterization of seismic facies,and use phase inversion to determine the reservoir as well as porosity relation to establish geological and seismic bridge,eventually carving three-dimensional category in three dimensions to describe and quantify geological body.This method can effectively characterize and obtain the geometric shape and effective volume value of the three types of reservoir spaces in karst slotted reservoirs,and achieve accurate quantitative description of such reservoirs.At present,this technique has been applied to the establishment of quantitative description standard and the compilation of reserve calculation scheme of carbonate fissure and cave reservoirs in the depth of Tarim basin,in the hope of realizing the progress of quantitative description technology of carbonate karst fissure and cave reservoirs.
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Li-Jun GAO, Zong-Jie LI, Hai-Ying LI, Hong WANG, Chao HUANG. The deep karst fissure and cavern reservoir in Tarim basin carved in three dimensions:Research and application of "five-step method" quantitative description technology. Geophysical and Geochemical Exploration, 2020, 44(3): 691-697.
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