潜山内幕火山岩储层特征及控制因素——以渤海海域秦皇岛30A地区白垩系为例
发布时间：2018-10-05 14:01
【摘要】：针对潜山内幕火山岩储层特征和控制因素复杂的难题,以渤海海域秦皇岛30A地区白垩系为例,通过岩芯观察、薄片鉴定和扫描电镜分析等,对潜山内幕火山岩储层储集空间类型、孔缝充填期次、成岩演化及控制因素进行研究。研究区火山岩储层以爆发相安山质火山角砾岩为主,储集空间分为原生孔隙、次生孔隙和裂缝3类。作为主要原生孔隙类型,储层中原生气孔先后经历早期充填和晚期充填两个充填阶段,导致原生孔隙大量减少。根据裂缝相互切割关系和充填矿物组合,将储层中裂缝分为四期,晚期裂缝充填程度低于早期裂缝。火山岩储层成岩演化经历同生成岩阶段、表生成岩阶段和埋藏成岩阶段3个阶段。同生成岩阶段火山热液作用对储层破坏作用最为明显,后期表生成岩阶段风化淋滤作用和埋藏成岩阶段溶蚀作用对储层物性进行了一定改善,但作用有限。未充填有效裂缝发育程度是控制潜山内幕火山岩储层物性和油气产能差异的关键因素。靠近大断裂和火山通道的构造高部位储层裂缝更为发育,但易受火山热液作用影响而被热液矿物充填,有效裂缝较少,储层渗透性和产能远低于距火山通道较远的斜坡带。构造部位、裂缝形成期次及宽度大小三个因素共同控制了有效裂缝发育。裂缝集中分布于靠近大断裂一定范围内,距火山通道较远、裂缝形成期次较晚且与油气成熟期和运聚期有效匹配、裂缝宽度较小的地区裂缝充填作用较弱,是有效裂缝和优质储层发育的有利地区,可作为下一步潜山内幕火山岩油气勘探的重点。
[Abstract]:In view of the complicated characteristics and controlling factors of volcanic rock reservoir in buried hill, taking the Cretaceous system of Qinhuangdao 30A area in Bohai Sea as an example, through core observation, thin slice identification and scanning electron microscope analysis, etc. The types of reservoir space, filling period of pore fractures, diagenetic evolution and controlling factors are studied. The volcanic rock reservoir in the study area is mainly composed of volcanic breccia of eruptive facies Anshan, and the reservoir space is divided into three types: primary pore, secondary pore and fracture. As the main primary pore type, the original gas pores in the reservoir have experienced two filling stages: early filling and late filling, which resulted in a large reduction of primary pores. According to the intercutting relationship of fractures and the combination of filling minerals, the fractures in the reservoir are divided into four stages, and the filling degree of the late fractures is lower than that of the early fractures. The diagenetic evolution of volcanic reservoir has three stages: syngenic stage, epigenetic stage and buried diagenesis stage. The volcanic hydrothermal process in the same generation rock stage has the most obvious effect on reservoir destruction, while weathering and leaching in the late stage of epigenetic rocks and dissolution in the burial diagenesis stage have improved the reservoir physical properties to some extent, but the effect is limited. The development degree of unfilled effective fractures is the key factor to control the physical properties and oil and gas productivity difference of volcanic reservoir in buried hill. The reservoir fractures near large faults and volcanic channels are more developed, but they are easily filled with hydrothermal minerals under the influence of volcanic hydrothermal process. The effective fractures are less, and the permeability and productivity of reservoirs are much lower than those of the slopes far away from the volcanic channels. The development of effective fractures is controlled by three factors: structural position, fracture forming period and width. The fractures are concentrated in a certain range near the large faults, far away from the volcanic channels, the fracture formation stage is late and effectively matched with the oil and gas maturity period and the migration and accumulation period, and the fracture filling in areas with small fracture width is weaker. It is a favorable area for the development of effective fractures and high quality reservoirs, and can be regarded as the key point of oil and gas exploration in buried hill insider volcanic rocks.
【作者单位】： 中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项(2011ZX05023-002)~~
【分类号】：P618.13
[Abstract]:In view of the complicated characteristics and controlling factors of volcanic rock reservoir in buried hill, taking the Cretaceous system of Qinhuangdao 30A area in Bohai Sea as an example, through core observation, thin slice identification and scanning electron microscope analysis, etc. The types of reservoir space, filling period of pore fractures, diagenetic evolution and controlling factors are studied. The volcanic rock reservoir in the study area is mainly composed of volcanic breccia of eruptive facies Anshan, and the reservoir space is divided into three types: primary pore, secondary pore and fracture. As the main primary pore type, the original gas pores in the reservoir have experienced two filling stages: early filling and late filling, which resulted in a large reduction of primary pores. According to the intercutting relationship of fractures and the combination of filling minerals, the fractures in the reservoir are divided into four stages, and the filling degree of the late fractures is lower than that of the early fractures. The diagenetic evolution of volcanic reservoir has three stages: syngenic stage, epigenetic stage and buried diagenesis stage. The volcanic hydrothermal process in the same generation rock stage has the most obvious effect on reservoir destruction, while weathering and leaching in the late stage of epigenetic rocks and dissolution in the burial diagenesis stage have improved the reservoir physical properties to some extent, but the effect is limited. The development degree of unfilled effective fractures is the key factor to control the physical properties and oil and gas productivity difference of volcanic reservoir in buried hill. The reservoir fractures near large faults and volcanic channels are more developed, but they are easily filled with hydrothermal minerals under the influence of volcanic hydrothermal process. The effective fractures are less, and the permeability and productivity of reservoirs are much lower than those of the slopes far away from the volcanic channels. The development of effective fractures is controlled by three factors: structural position, fracture forming period and width. The fractures are concentrated in a certain range near the large faults, far away from the volcanic channels, the fracture formation stage is late and effectively matched with the oil and gas maturity period and the migration and accumulation period, and the fracture filling in areas with small fracture width is weaker. It is a favorable area for the development of effective fractures and high quality reservoirs, and can be regarded as the key point of oil and gas exploration in buried hill insider volcanic rocks.
【作者单位】： 中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项(2011ZX05023-002)~~
【分类号】：P618.13
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