济阳坳陷下古生界潜山油气藏特征及成藏模式

济阳坳陷下古生界潜山具有多样性、复杂性的特点，潜山差异性的形成演化、油气成藏主控因素和控藏模式不明确，严重制约了该区潜山油气勘探。在潜山分类的基础上，综合利用系统恢复、分类对比和典型解剖等方法，揭示了济阳坳陷下古生界不同类型潜山的形成演化过程和油气成藏主控因素差异性，分类建立了油气成藏模式。研究表明，济阳坳陷下古生界主要发育高位新盖侵蚀残丘潜山、中位古盖拉张断块潜山、中位新古盖拉张剪切断块潜山、中位中古盖挤压拉张断块潜山和低位古盖拉张滑脱断块潜山5种潜山类型。不同类型潜山的形成演化和油气成藏各具特色，其中，高位新盖侵蚀残丘潜山的发育受隆升、侵蚀作用控制，油气成藏主要受控于油源和盖层条件，表现为"单向供烃、砂体-不整合岩溶体联合输导、残丘控藏"的成藏模式；中位古盖拉张断块潜山的发育受掀斜、断裂作用控制，油气成藏主要受控于储集条件，表现为"单向供烃、顺向断层输导、反向断层控藏"的成藏模式；中位新古盖拉张剪切断块潜山的发育受反转、翘倾和走滑切割作用控制，油气成藏主要受控于输导条件，表现为"多源供烃、断溶体立体输导、断裂控藏"的成藏模式；中位中古盖挤压拉张断块潜山的形成受强烈挤压、拉张滑脱作用控制，油气成藏主要受控于储集条件，表现为"多源供烃、断缝体输导、断褶控藏"的成藏模式；低位古盖拉张滑脱断块潜山的形成受强烈拉张滑脱作用控制，油气成藏主要受控于输导条件，表现为"顶部供烃、断缝体输导、断裂控藏"的成藏模式。

The reservoir characteristics and hydrocarbon accumulation model of Lower Paleozoic buried-hill in Jiyang depression

The Lower Paleozoic buried hills in Jiyang depression are characterized with diversity and complexity. Researchers still have not made clear the formation and evolution of buried-hill diversity, main controlling factors of petroleum accumulations, and hydrocarbon accumulation model, thus seriously restricting the petroleum exploration of buried hills in the study area. Based on classifying the types of buried hills, comprehensively using such methods as systematic restoration, types comparison, and typical analysis, this paper reveals the formation and evolution processes of Lower Paleozoic buried hills, and the differences in the main controlling factors of hydrocarbon accumulation, and also establishes hydrocarbon accumulation models according to various types. The study shows that five types of Lower Paleozoic buried hills are mainly developed in in Jiyang depression, i.e., high-stand new cover massive eroding residual buried hill, middle-stand Paleozoic cover extensional fault block buried hill, middle-stand new-Paleozoic cover tensional-shearing fault block buried hill, middle-stand Mesozoic-Paleozoic cover compressional-extensional fault block buried hill, and low-stand Paleozoic cover extensional decollement fault block buried hill. Various buried hills have distinctive formation and evolution processes and hydrocarbon accumulation models. Among them, the development of high-stand new cover massive eroding residual buried hill is controlled by uplift and erosion, and its hydrocarbon accumulation is mainly controlled by the oil source and cover, presenting the accumulation model of "one-way hydrocarbon supply, combined transport by sand body-unconformity karst body, and reservoir controlling by residual hills "; the development of middle-stand Paleozoic cover extensional fault block buried hill is controlled by tilting and faulting, and its hydrocarbon accumulation is mainly controlled by the reservoir conditions, showing the accumulation model of "one-way hydrocarbon supply, transport by consequent fault, and reservoir controlling by antithetic faults"; the development of middle-stand new-Paleozoic cover tensional-shearing fault block buried hill is controlled by inversion, tilting and strike-slip cutting, and its hydrocarbon accumulation is mainly controlled by the transport conditions, displaying the accumulation model of "multi-source hydrocarbon supply, three-dimensional transport by the fault controlling dissolution, and reservoir controlling by faults"; the formation of medium-stand Mesozoic-Paleozoic cover compressional-extensional fault block buried hill is controlled by intensive compression and extensional detachment, and its hydrocarbon accumulation is mainly controlled by the reservoir conditions, which is represented by the accumulation model of "multi-source hydrocarbon supply, transport by fault-fracture reservoirs, and reservoir controlling by fault folds"; the formation of low-stand Paleozoic cover extensional detachment fault block buried hill is controlled by intensive extensional detachment, and its hydrocarbon accumulation is mainly controlled by the transport conditions, shown as the accumulation model of "top hydrocarbon supply, transport by fault-fracture reservoirs, and reservoir controlling by faults".