Influence of source-reservoir configuration patterns of hydrocarbon accumulation elements on tight oil convergence: A case study of Gaotaizi reservoir in Qijia area of Songliao Basin
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摘要:
基于岩心观察，薄片鉴定、物性及地球化学分析等工作，对松辽盆地齐家地区高台子油层组的源－储特征等进行了精细研究，发现致密油成藏要素源储配置模式对油藏汇聚具控制作用. 研究区致密油层源储配置模式主要为下源上储型、厚源储夹层型以及薄源储互层型. 下源上储型具有形成工业油气流的潜力，但储层厚度欠发育，易形成干层与油层互层；厚源储夹层型的源－储条件较好，具有较强的工业油流潜力；薄源储互层型的储层发育，但地球化学条件一般，油气显示较弱. 故研究区致密油多分布于以下源上储和厚源储夹层型为主的高Ⅳ油层组中上部，以及以厚源储夹层型为主的高Ⅲ油层组的下部. 平面上以发育前三角洲亚相沉积的研究区南部为生烃中心，向北以发育三角洲前缘亚相沉积的研究区中部为致密油有利区.
Abstract:Based on core observation, thin section identification, physical property and geochemical analysis, with detailed study on the source-reservoir characteristics of Gaotaizi oil reservoir in Qijia area of Songliao Basin, it is found that the source-reservoir configuration patterns of tight oil accumulation elements control the oil reservoir convergence. The source-reservoir configuration patterns of tight oil layers in the area are mainly lower-source-upper-reservoir type, thick source-reservoir interlayer type, and thin source-reservoir interbedded type. The lower-source-upper-reservoir type has the potential to form industrial oil-gas flow, but the reservoir thickness is underdeveloped and easy to form interbeds of dry layer and oil layer. The thick source-reservoir interlayer type has good source-reservoir conditions with great potential for industrial oil flow. The thin source-reservoir interbedded type is developed with reservoirs, but the geochemical conditions are ordinary, with weak oil-gas indication. Therefore, tight oil in the area is distributed mainly in the middle-upper part of G-Ⅳ reservoir, which is dominated by the lower-source-upper-reservoir and thick source-reservoir interlayer types, and the lower part of G-Ⅲ reservoir dominated by thick source-reservoir interlayer type. In the plane view, the south of the study area with developed prodelta subfacies deposits is the hydrocarbon generation center. To the north, the central part of the study area, where delta front subfacies deposits are developed, is favorable area for tight oil.
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