CHARACTERISTICS OF MESOZOIC VOLCANIC RESERVOIR ROCKS AND THEIR MAIN CONTROLLING FACTORS IN THE CENTRAL BOHAI SEA
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摘要:
以海域最新钻探成果为基础，基于岩心、薄片及物性分析等资料，明确了渤海海域中部地区中生界火山岩储层特征，并探讨了优质储层形成的主控因素。结果表明：研究区火山岩储层储集空间包括原生气孔、溶蚀孔以及裂缝，其中溶蚀孔与构造裂缝是主要的储集空间类型；优势岩相、断裂活动以及风化作用共同控制了优质储层的形成，其中近火山口爆发相带储集物性最好，大型断裂持续活动形成的裂缝是优质储层形成的关键，而长期的风化淋滤使储层得到进一步改善。优选断裂带附近火山口相带进行钻探可有效减低火山岩勘探风险。
Abstract:Based on the latest data from drilling cores, thin sections and tests of physical properties, the characteristics of the Mesozoic volcanic reservoir spaces and their controlling factors in the Central Bohai Sea area are studied in this paper. The results suggest that: The volcanic reservoir space in the study area includes primary pores, dissolution pores and fractures, among which dissolution pores and structural fractures dominate; Volcanic rock facies, fault activity and weathering process jointly control the formation of high-quality volcanic reservoirs, and the outburst facies zone near-crater is the one with best reservoir physical properties. The fractures formed by the continuous activity of large faults are one of the key factors to the formation of high-quality reservoirs, while the long-term weathering and leaching make the reservoirs further improved in physical properties. The risk of oil and gas exploration in volcanic rocks can be effectively reduced if drilling is made in the craters near fault zone.
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Key words:
- Central Bohai Sea area /
- Mesozoic /
- volcanic reservoir /
- main controlling factors
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表 1 火山岩相统计
Table 1. Statistics of volcanic rock facies
岩相 亚相 厚度 百分比 I火山通道 I3隐爆角砾岩 \ \ I2次火山岩 80 3.83% I1火山颈 \ \ II爆发相 II3热碎屑流 141.65 6.78% II2热基浪 301.5 14.44% II1空落 103 4.93% III喷溢相 III3上部 277.85 13.30% III2中部 158.46 7.59% III1下部 1 005.44 48.15% IV侵出相 IV3外带 \ \ IV2中带 \ \ IV1内带 \ \ V火山沉积岩相 V3凝灰岩夹煤沉积 \ \ V2再搬运火山碎屑沉积岩 20.45 0.98% V1含外碎屑火山碎屑沉积岩 \ \ 
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