CAJ | 학술논문

塔河油田4区下奥陶统碳酸盐岩储层以溶洞、溶孔和裂缝为主，溶洞是最有效的储集体，裂缝次之。基质孔渗性极差，难以构成有效的储集空间。受海西早期构造运动的影响，研究区发育北北东、北北西以及北东向3个方向的裂缝。综合岩芯岩溶特征描述、电子探针元素分析以及同位素分析等方面的研究，发现研究区发育4期岩溶作用，其中加里东中晚期与海西早期的岩溶作用对研究区溶洞的形成起到了重要的控制作用。岩溶地貌控制了缝洞型储集体的分布，处在不同岩溶相带的古水系对缝洞体形态产生影响，断裂及其伴生裂缝增加了地表水及地下水与碳酸盐岩的接触面积和溶蚀范围，使得研究区内放空漏失井90%集中在断裂带附近，断裂带是裂缝与岩溶发育的密集带。
탑하유전4구하오도통탄산염암저층이용동、용공화렬봉위주，용동시최유효적저집체，렬봉차지。기질공삼성겁차，난이구성유효적저집공간。수해서조기구조운동적영향，연구구발육북북동、북북서이급북동향3개방향적렬봉。종합암심암용특정묘술、전자탐침원소분석이급동위소분석등방면적연구，발현연구구발육4기암용작용，기중가리동중만기여해서조기적암용작용대연구구용동적형성기도료중요적공제작용。암용지모공제료봉동형저집체적분포，처재불동암용상대적고수계대봉동체형태산생영향，단렬급기반생렬봉증가료지표수급지하수여탄산염암적접촉면적화용식범위，사득연구구내방공루실정90%집중재단렬대부근，단렬대시렬봉여암용발육적밀집대。
Cave,solution pore and fracture are the primary reservoir spaces in Lower Ordovician,the 4th block of Tahe Oilfield. Cave is the most effective reservoir,while fracture takes the second place. It is difficult to form effective reservoir for matrix, owing to its poor porosity and permeability. Effected by the tectonic movement of early hercynian,the fracture was mainly distributed in the direction of NNE,NNW and NE. Integrated with description of the karst feature of core,electronic probe element analysis and isotope analysis,we found that there are four periods of karstification in this area,of which the periods of Middle-Late Caledonian and early hercynian played an important role in controlling the formation of the karst cave. Karst controlled the distribution of fracture-cave reservoir,and the ancestral water system located in different karst areas had impact on the shape of cave-fracture body. Fracture and its accompanying crack not only increased the contact area but also improved the solution range of the surface and ground water with the carbonate reservoir,which caused 90%wells with drilling empty and mud loss distributed near the fault zone,where karst developed very well.