CAJ | 학술논문

以鄂尔多斯盆地靖边气田北部马家沟组马五14小层为例，通过详细的井下地质调查、典型成岩特征写实、系统取样和室内测试等研究，以地质背景和古岩溶岩石学特征为主线，精细解剖风化壳古岩溶型碳酸盐岩储层成岩作用特征，并进行成岩相识别。研究发现：马五14小层海水成岩环境以白云岩化作用和硬石膏化作用为主，受控于古地理格局；表生成岩环境发育溶孔缝型和溶洞型溶解充填作用，受控于古岩溶地貌；埋藏成岩环境常见扩溶型溶解作用。基于成岩作用与孔渗网络耦合关系，采用“海水成岩环境成岩作用＋表生成岩环境成岩作用”组合原则划分出4种典型成岩相类型：（Ⅰ）硬石膏小结核白云岩化—溶孔缝型中—弱充填相，（Ⅱ）硬石膏小结核白云岩化—溶孔缝型中—强充填相，（Ⅲ）白云岩化—溶洞型强充填相，（Ⅳ）硬石膏岩化—溶孔缝型强充填—溶洞型强充填相。其中Ⅰ类相区优质储集岩类发育，岩溶强度适中，（沉淀）充填中—弱，易形成裂缝—溶（孔）洞型储层，是为最有利的成岩相区。
이악이다사분지정변기전북부마가구조마오14소층위례，통과상세적정하지질조사、전형성암특정사실、계통취양화실내측시등연구，이지질배경화고암용암석학특정위주선，정세해부풍화각고암용형탄산염암저층성암작용특정，병진행성암상식별。연구발현：마오14소층해수성암배경이백운암화작용화경석고화작용위주，수공우고지리격국；표생성암배경발육용공봉형화용동형용해충전작용，수공우고암용지모；매장성암배경상견확용형용해작용。기우성암작용여공삼망락우합관계，채용“해수성암배경성암작용＋표생성암배경성암작용”조합원칙화분출4충전형성암상류형：（Ⅰ）경석고소결핵백운암화—용공봉형중—약충전상，（Ⅱ）경석고소결핵백운암화—용공봉형중—강충전상，（Ⅲ）백운암화—용동형강충전상，（Ⅳ）경석고암화—용공봉형강충전—용동형강충전상。기중Ⅰ류상구우질저집암류발육，암용강도괄중，（침정）충전중—약，역형성렬봉—용（공）동형저층，시위최유리적성암상구。
In the north of the Jingbian Gas Field in the Ordos Basin, a case study was made of the first section of the fourth sub?member of the fifth member of the Majiagou Formation ( M514 ) . Through detailed subsurface geo?logical analysis, a realistic description of typical diagenetic features, systematic sampling and laboratory testing, with geological background and petrological characteristics as main clue, the diagenesis characteristics of crust?weathered ancient karst carbonate reservoirs were analyzed, and the diagenetic facies were recognized. The ma?rine diagenetic environment of M514 was influenced by dolomitization and anhydritization, and was controlled by the palaeogeographic framework. As to the epidiagenetic environment controlled by ancient karst physiognomy, dissolution and packing effects of dissolved pore, fracture and cave types took place. For the buried diagenetic environment, extensive dissolution was common. Based on the coupling relationship between diagenesis and porosity-permeability network, a“diagenesis in marine diagenetic environment +diagenesis in epidiagenetic en?vironment” combination principle was adopted to divide the diagenetic facies into four typical types:(Ⅰ) medium-weak filling facies of anhydrite small nodule dolomitization-dissolved pore and fracture type;(Ⅱ) medium-strong filling facies of anhydrite small nodule dolomitization-dissolved pore and fracture type;(Ⅲ) strong filling facies of dolomitization-dissolved cave type;and (Ⅳ) strong filling facies of anhydrite lithifi?cation-dissolved pore and fracture type, and strong filling facies of dissolved cave type. With well?developed premium reservoir rocks, moderate karst intensity and medium-weak ( deposition) filling, the type?Ⅰ area was favorable for fracture-cave reservoir development.