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碳酸盐岩沉积微相不仅揭示了水动力特征及其沉积环境,也是后期储层发育的物质基础,在油气勘探中具有重要意义。通过大量薄片及岩心资料划分出塔中北斜坡鹰山组Mf1—Mf10 10种沉积微相类型,及MA1—MA4 4种沉积微相序列,其在平面上沿塔中一号断裂带呈条带状展布,靠近台地边缘附近多发育高能—中高能滩型微相序列(MA1—MA2),而台地内部能量相对下降,主要发育中低能潮坪型微相序列(MA3)低能白云质潮坪型微相序列(MA4);从鹰二段至鹰一段沉积时期,由相对低能沉积微相序列(MA3—MA4)向高能沉积微相序列(MA1—MA2)发生转化,鹰一段沉积晚期是滩体形成的主要时期,沉积环境水体能量向上逐渐增强。鹰山组顶部高能沉积微相发育多种孔隙类型,且易于发育构造裂缝并接受岩溶作用改造,是有利储层发育的物质基础。
Carbonate sedimentary microfacies not only reveal the hydrodynamic characteristics and sedimentary environment, but also the material basis for the later reservoir development, which is of great significance in oil and gas exploration. Based on a large number of thin slices and core data, 10 types of Mf1-Mf10 sedimentary microfacies and 4 MA1-MA4 sedimentary microfacies sequences of the Yingshan Formation in the northern Tarim Basin are classified. They are in the plane along the Tazhong No.1 fault zone (MA1-MA2) near the edge of the platform, while the internal energy of the platform is relatively decreased. The low and medium energy tidal flat facies MA3 (low energy white cloud tide plateau) (MA4). From the second member to the first member of the Eagles, the relatively low-energy sedimentary microfacies sequence (MA3-MA4) was transformed into the high-energy sedimentary microfacies sequence (MA1-MA2) During the main period of body formation, the energy of sedimentary environment water body gradually increased. The high-energy sedimentary microfacies at the top of Yingshan Formation developed a variety of pore types and are prone to develop structural fractures and are subject to karstification transformation, which is the material basis for favorable reservoir development.