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准噶尔盆地腹部石南地区是中国陆相盆地岩性地层油气藏勘探的重点地区,该区油气藏的油源主要在二叠系,侏罗系主要表现为一套缓坡浅水背景下的三角洲沉积体系,新近纪构造运动对盆地构造的掀斜作用,致使岩性地层圈闭发生改造,早期油气藏发生调整。在这种源外缓坡背景下,岩性地层圈闭的形成条件、沟通油源的输导体系复杂,岩性地层油气藏的形成主控因素和成藏模式不清,再加上该区地震资料品质差、地震分辨率低,这些因素造成该区岩性地层勘探的复杂性。针对研究区存在的上述难点,对研究区的构造特征和沉积背景进行分析。在此基础上,对研究区典型岩性油气藏进行解剖,建立了断裂—沉积体系侧缘—近等深侧向运聚成藏模式,即油气沿断裂进入储集砂体后,垂直构造等高线向构造高部位运移,当遇到与构造斜交的沉积体系侧缘时,油气运移方向发生调整,沿沉积体系侧缘近等深侧向运移,边运聚边成藏模式。
The southern part of the Junggar basin is a key area for hydrocarbon exploration in the lithostratigraphy of the continental basins in China. The oil sources of the reservoirs in this area are mainly Permian and Jurassic mainly in the delta sedimentation system under the gentle slope and shallow water background The Neoproterozoic tectonic movement tilted the basin structure, resulting in the alteration of lithologic stratigraphic traps and the adjustment of early oil and gas reservoirs. Under the background of gentle source and gentle slope, the forming conditions of lithologic stratigraphic traps, complicated communication systems of oil source, unclear formation of lithologic stratigraphic reservoirs and the pattern of reservoir formation, together with the seismicity of the area The poor quality of the data and the low resolution of the earthquakes complicate the exploration of the lithologic strata in this area. According to the above difficulties existing in the study area, the tectonic characteristics and sedimentary background of the study area are analyzed. On this basis, the typical lithologic reservoirs in the study area are dissected to establish the lateral-near-equatorial lateral migration-accumulation model of the fault-sedimentary system. That is, the vertical migration and accumulation of oil and gas into the sand body along the fault The high line moves to high tectonic positions. When confronted with the lateral margin of the depositional system, the direction of migration of oil and gas is adjusted. .