论文部分内容阅读
蓬莱１９－３油田位于渤海海域渤南凸起中段的东北端、郯庐断裂带的东支，油田构造类型属于在古隆起背景上发育起来的、被断层复杂化了的断裂背斜。主力油层发育于上第三系馆陶组和明化镇组下段，储集层岩性为河流相的陆源碎屑岩，油层厚度６３－１５ｌｍ，含油面积５０ｋｍ～２以上，石油地质储量为数亿吨级。蓬莱１９－３油田断层十分发育，浅层构造破碎，油气分布产状及压力系统较复杂，属于由多断块组成的、纵横向上存在多套油水系统的构造层状油藏。地面原油密度较大、黏度较高、凝固点低，地层原油饱和压力较高、地饱压差小，溶解气油比中等，原油的生物降解和水洗作用较为明显。油源对比分析表明，油气主要来自周缘凹陷下第三系东营组下段和沙河街组的烃源岩。据区域构造史研究，蓬莱１９－３构造的发展、定型以及油藏的形成与郯庐断裂长期强烈的构造运动有着密切关系，特别是晚第三纪的多次构造活动导致新生界产生众多断裂和大量微裂缝，成为油气由凹陷向凸起运移的良好通道，为蓬莱１９－３构造的最终成藏起到了重要作用。图５参３（郭太现摘）
The Penglai 19-3 oilfield is located at the northeast end of the central Bonan bulge in the Bohai Sea, and the east branch of the Tanlu fault zone. The oilfield structural type belongs to the fault anticline developed on the paleo-uplift background and complicated by faults. The main reservoir is developed in the lower Tertiary Guantao Formation and the lower part of Minghua Town Formation. The reservoir lithology is terrigenous clastic rocks of fluvial facies. The thickness of oil layer is 63-15lm, with an oil-bearing area of 50km ~ 2 and above, Tons of tons. The fault of Penglai 19-3 oilfield develops well, the shallow structure is broken, the distribution of oil and gas and the pressure system are complicated, which belongs to the structural layered reservoirs composed of multiple fault blocks with multiple sets of oil and water systems in vertical and horizontal directions. The crude oil has higher density, higher viscosity, lower freezing point, higher saturated pressure of crude oil in the formation, less saturated pressure and lower dissolved gas-oil ratio. The biodegradation and washing effect of crude oil are more obvious. The comparative analysis of oil sources shows that oil and gas mainly come from the source rocks of the lower part of Dongying Formation and Shahejie Formation of the Tertiary in the peripheral depression. According to the study of regional tectonic history, the development of Penglai 19-3 structure, formation and formation of reservoirs are closely related to the long-term intense tectonic movement of the Tan-Lu fault. In particular, the numerous tectonic activities in the Late Tertiary led to numerous faults in the Cenozoic And a large number of micro-fractures, as a good channel for oil and gas migration from the depression to the bulge, plays an important role in the ultimate accumulation of Penglai 19-3 structure. Figure 5 Reference 3 (Guo Taixi Abstract)