【摘要】：針對(duì)潛山內(nèi)幕火山巖儲(chǔ)層特征和控制因素復(fù)雜的難題,以渤海海域秦皇島30A地區(qū)白堊系為例,通過(guò)巖芯觀察、薄片鑒定和掃描電鏡分析等,對(duì)潛山內(nèi)幕火山巖儲(chǔ)層儲(chǔ)集空間類(lèi)型、孔縫充填期次、成巖演化及控制因素進(jìn)行研究。研究區(qū)火山巖儲(chǔ)層以爆發(fā)相安山質(zhì)火山角礫巖為主,儲(chǔ)集空間分為原生孔隙、次生孔隙和裂縫3類(lèi)。作為主要原生孔隙類(lèi)型,儲(chǔ)層中原生氣孔先后經(jīng)歷早期充填和晚期充填兩個(gè)充填階段,導(dǎo)致原生孔隙大量減少。根據(jù)裂縫相互切割關(guān)系和充填礦物組合,將儲(chǔ)層中裂縫分為四期,晚期裂縫充填程度低于早期裂縫�；鹕綆r儲(chǔ)層成巖演化經(jīng)歷同生成巖階段、表生成巖階段和埋藏成巖階段3個(gè)階段。同生成巖階段火山熱液作用對(duì)儲(chǔ)層破壞作用最為明顯,后期表生成巖階段風(fēng)化淋濾作用和埋藏成巖階段溶蝕作用對(duì)儲(chǔ)層物性進(jìn)行了一定改善,但作用有限。未充填有效裂縫發(fā)育程度是控制潛山內(nèi)幕火山巖儲(chǔ)層物性和油氣產(chǎn)能差異的關(guān)鍵因素�？拷髷嗔押突鹕酵ǖ赖臉�(gòu)造高部位儲(chǔ)層裂縫更為發(fā)育,但易受火山熱液作用影響而被熱液礦物充填,有效裂縫較少,儲(chǔ)層滲透性和產(chǎn)能遠(yuǎn)低于距火山通道較遠(yuǎn)的斜坡帶。構(gòu)造部位、裂縫形成期次及寬度大小三個(gè)因素共同控制了有效裂縫發(fā)育。裂縫集中分布于靠近大斷裂一定范圍內(nèi),距火山通道較遠(yuǎn)、裂縫形成期次較晚且與油氣成熟期和運(yùn)聚期有效匹配、裂縫寬度較小的地區(qū)裂縫充填作用較弱,是有效裂縫和優(yōu)質(zhì)儲(chǔ)層發(fā)育的有利地區(qū),可作為下一步潛山內(nèi)幕火山巖油氣勘探的重點(diǎn)。
[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.
【作者單位】： 中海石油(中國(guó))有限公司天津分公司;
【基金】：國(guó)家科技重大專(zhuān)項(xiàng)(2011ZX05023-002)~~
【分類(lèi)號(hào)】：P618.13

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