Abstract: By i ntegrating geological and geophysical data from over a decade of exploration and development in the Amu Darya right bank block, a three-dimensional geological model was constructed to simulate the petroleum system. This study aims to evaluate the hydrocarbon resources in the Callovian-Oxfordian carbonate and the Lower-Middle Jurassic sandstone reservoirs within the Amu Darya right bank block. The integrated geochemical data were used to calibrate the geological and thermal models, thereby constraining the simulation process. The results indicate that 3.82×10⁸t of oil and 27 786×10⁸m³ of natural gas are detected in Callovian-Oxfordian carbonate reservoirs, and 0.24×10⁸t of oil and 14 479×10⁸m³ of gas in the Lower-Middle Jurassic sandstone reservoirs within the Amu Darya right bank block. The proven natural gas reserves in carbonate reservoirs is approximately 22 % . Incorporating the gas resources in sandstone reservoirs, the proven natural gas reserves in the Amu Darya right bank block is about 15 %, indicating promising exploration potential in this region. The major gas fields in the Amu Darya right bank block, such as Samandepe, Bereketli-Pirguyi, and Yanguyi-Chashguyi, are suitable for deploying infill wells for carbonate rocks and exploratory wells for sandstone gas reservoirs, with relatively low exploration risks. Hydrocarbon exploration in the eastern section of the Amu Darya right bank block is associated with elevated geological risks, yet may yield higher returns. The deep intervals of Agayry gas field potentially host the largest continuous sandstone gas accumulation within the current block, representing a structurally intact reservoir system. The eastern section of the block exhibits the characteristic of "one structural high corresponding to one gas reservoir", where the basic elements of hydrocarbon accumulation, such as source rocks, reservoirs and cap rocks, have developed on a large scale. Consequently, the research focus should be on identifying structural highs beneath gypsum-salt layers and accurately characterizing trap structure.

Key words: Amu Darya right bank, Callovian-Oxfordian stages, carbonate rocks, Lower-Middle Jurassic, evaluation of oil and gas resources, proven resource reserves, exploratory well placement

摘要： 整合阿姆河右岸区块十余年勘探开发的地质、地球物理数据,构建了三维地质模型,开展三维含油气系统模拟,以评价阿姆河右岸区块卡洛夫阶—牛津阶碳酸盐岩与中—下侏罗统砂岩层中的油气资源。综合地球化学数据对地质模型与热模型进行校准,约束模拟过 程。研究结果表明:阿姆河右岸区块卡洛夫阶—牛津阶碳酸盐岩储层的石油资源量为3.82×10⁸t,天然气资源量为27 786×10⁸m³;中—下侏罗统砂岩储层的石油资源量为0.24×10⁸t,天然气资源量为14 479×10⁸m³。碳酸盐岩储层的天然气资源探明率约为22 % ,综合砂岩的天然气资源量,阿姆河右岸区块天然气资源的探明率约为15 % ,阿姆河右岸区块天然气资源的勘探前景明朗。现今阿姆河右岸区块的主力气田,如萨曼杰佩气田、别-皮气田、扬-恰气田等既适合部署针对碳酸盐岩气藏的加密井,也适合部署针对砂岩气藏的探井,风险较低;区块东部油气勘探的地质风险较大,但收益可能更高。阿盖雷气田深层可能发育现今区块内规模最大的整装砂岩气藏。阿姆河右岸区块东部具有"一高点一气藏"的特征,其生-储-盖成藏要素大规模发育,故研究重点应该聚焦于膏盐层下的构造高点识别,精准刻画圈闭形态。

关键词: 阿姆河右岸, 卡洛夫阶—牛津阶, 碳酸盐岩, 中—下侏罗统, 油气资源评价, 资源探明率, 探井部署