CAJ | 학술논문

根据研究区单井沉积微相、单砂层的厚度、砂地比等空间分布特征，研究其沉积微相空间展布规律。古龙南凹陷葡萄花油层储层发育水下分流河道、分流河道间、河口坝、前缘席状砂、前三角洲泥和浅湖泥沉积微相，物源主要来自于北部和西部。研究区河口坝发育较少，前缘席状砂分布宽阔，为典型的浅水三角洲沉积。从下向上，湖平面下降，各砂层砂岩的厚度、粒度均有增加的趋势，形成了进积式地层序列。且从下向上三角洲前缘席状砂分布范围扩大，席状砂体形状由下部的东西向条带状向上转化为大面积席状，判定其物源早期以北部物源为主，晚期以西部物源为主。凹陷中心早期条带状砂层及晚期片状大型透镜体砂层为有利砂体。
근거연구구단정침적미상、단사층적후도、사지비등공간분포특정，연구기침적미상공간전포규률。고룡남요함포도화유층저층발육수하분류하도、분류하도간、하구패、전연석상사、전삼각주니화천호니침적미상，물원주요래자우북부화서부。연구구하구패발육교소，전연석상사분포관활，위전형적천수삼각주침적。종하향상，호평면하강，각사층사암적후도、립도균유증가적추세，형성료진적식지층서렬。차종하향상삼각주전연석상사분포범위확대，석상사체형상유하부적동서향조대상향상전화위대면적석상，판정기물원조기이북부물원위주，만기이서부물원위주。요함중심조기조대상사층급만기편상대형투경체사층위유리사체。
Based on characteristics and spatial distribution patterns of single-well sedimentary microfacies ,gross-to-net ra-tio and thickness of single sandstone layer of the Putaohua reservoir in south Gulong sag of Songliao Basin ,we studied the spatial distribution pattern of sedimentary microfacies and predicted favorable sand bodies .The Putaohua reservoir con-sists of various sedimentary microfacies including distributary channels ,interdistributary channels ,mouth bars,front sheet sand ,front delta mud and shallow lake mud ,with sediments mainly sourced from the north and the west .It is of a typical shallow-delta deposit characterized by poor-developed mouth bars but wide front sheet sandstones .From bottom to top ,the thickness and the grain size of sandstone layers increase with the lake level dropping ,indicating a progradational strati-graphic sequence .In addition ,the areas of front sheet sandstones also enlarge upwards and their shapes change from EW -trending strips in the lower part into large sheets in the upper part .The provenance is mainly located in the north at the early stage ,while is mainly located in the west at the late stage .The early banded sand layers and the later large sheet-shape lenticular sand layers at the center of the sag are favorable sandbodies .