关键词: 松辽盆地南部, 致密油, 页岩油, 基岩气藏, 煤层气, 裂缝性油藏

Abstract: After experiencing hydrocarbon survey, tectonic and lithological reservoir exploration and development, the southern Songliao Basin has entered the stage of unconventional hydrocarbon exploration and development. Besides further exploring the development potential of available oil-gas resources, to seek the new fields and new types of oil-gas resources has become crucial for supporting the long-term growth of oilfield companies. By comprehensively evaluation, this study selects five new fields with breakthroughs or potentials in exploration and development, including the tight oil of Fuyang reservoir, shale oil of Changling sag, basement gas reservoir, coalbed methane reservoir, and fractured oil reservoir. Their typical geological characteristics and resource potentials are analyzed, and the next breakthrough direction is pointed out. These five types of oil-gas resources have substantial exploration and development potential, and there are differences in the levels of geological study, practice stages, and breakthrough directions. The resources of tight oil in Fuyang reservoir amount to 10×10⁸t, with the cumulative proven reserves of 1.28×10⁸t since 2014, and some plays have achieved cost-effective development and are in the stage of expanding exploration and development, which are the key research field. Moreover, the study selects five sweet spots in tight oil reservoirs, including Rangzijing, Xinbei-Miaoxi, Yuzijing, Gudian, and Daqingzijing, aiming to continuously promote the integrated strategy of increasing reserves and production. The resources of shale oil sweet spots in Changling sag amount to 16.8×10⁸t, achieving industrial breakthroughs and currently in the breakthrough stage of pilot test. This study mainly focuses on two sweet spots, i.e., Yuzijing and Tahucheng, and two sets of sweet spot intervals, i.e., the upper interval (Q1-Q3 layers) and the lower interval (Q9 layer) of Qingshankou Formation, and accelerating the technological breakthrough in supporting techniques, so as to achieve commercial breakthroughs as soon as possible. The other three types of oil-gas resources are all in the exploration stage, for which it is necessary to strengthen the understanding of exploration theory, promote the evaluation of resource potential, optimize favorable plays, and further reveal the exploration and development prospects.

Key words: southern Songliao Basin, tight oil, shale oil, basement gas reservoir, coalbed methane, fractured reservoir