鸭儿峡地区白垩系下沟组沟一3亚段(K1g13)是酒泉盆地的主要产油层段之一,但对其沉积相、有利储层影响因素与分布规律认识不清.以酒泉盆地鸭儿峡地区白垩系下沟组K1g13为研究对象,分析岩心、测井及室内测试等资料,探讨其沉积相类型及有利储层分布.结果表明,鸭儿峡地区下沟组K1g13主要发育扇三角洲—湖泊及近岸水下扇—湖泊两大沉积体系,可进一步识别出8种亚相、16种微相;有利储层分布受沉积相带及溶蚀带展布的双重控制.水下分流河道及河口沙坝均是主要的有利储层沉积相带,次生溶蚀孔是主要的储集空间,其发育主要受长石含量、岩屑及杂基含量、埋深等因素的控制;叠合优势沉积微相、溶蚀带分布及埋深图等,预测鸭儿峡地区白垩系下沟组K1g13有利储层分布区东以鸭西1-1-鸭西116井为界,西以鸭西115-柳10井为界,南至鸭西5井,北至鸭西112井.%The submember of the first member of Cretaceous Xiagou Formation (K1g13) is one of the main oilproducing intervals in Ya'erxia area,Jiuquan Basin.However,the understanding of its sedimentary facies and influencing factors and distribution of favorable reservoirs are unclear.Based on the data of core,well logging,oil production test,the sedimentary facies and favorable reservoir distribution of K1g13 in Ya'erxia area were discussed.The results show that fan delta-lacustrine and nearshore subaqueous fan-lacustrine sedimentary systems are mainly developed in K1 g13,which can be further divided into eight types of subfacies and 16 types of microfacies,and the favorable reservoir distribution is controlled by sedimentary facies belt and dissolution zone.The subaqueous distributary channel and mouth bar are the main favorable sedimentary facies belts.The secondary dissolved pores are the main reservoir spaces,and their development is mainly controlled by the content of feldspar,debris and matrix,and burial depth.By superposing the dissolution zone and favorable microfacies on the structural map,the distribution of favorable reservoirs of K1 g13 was predicted:east to well Yaxi 1-1 and well Yaxi 116,west to well Yaxi 115 and well Liu 10,south to well Yaxi 5,and north to well Yaxi 112.
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