Gas Source Rock Features and Controlling Factors for Biogas Formation in Holocene Series in Zhejiang Coastal Plain
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摘要: 本区气源岩主要为近岸浅海环境的灰色淤泥质粘土层和受海水影响的河漫滩环境的灰—灰黑色粘土及淤泥质粘土层。浅海相气源岩为弱还原—还原环境下沉积的,河漫滩相气源岩为弱还原—强还原环境下的产物,总体上看,后者比前者还原性和生气能力要强,浙北比浙南要强。本区生物气生成主要受沉积环境、沉积时间、古气候、海平面变化、地壳沉降和沉积速率、水介质这七大因素控制,它们相互作用,相互影响,有利于河漫滩相气源岩中生物甲烷气的大量生成和富集成藏。Abstract: The gas source rocks in this area are mainly grey mud deposited in inner sublittoral enviornment and grey-greyish black muddeposited in flood land environment influenced by sea water. Shallow-sea facies gas source rock deposited in weak reduction-reduc-lion environment, and flood land facies gas source rock deposited in light reduction-high reduction environment. On the whole, thelatter has higher reductibility and stronger gas-yielding capacity than the former, and which in the north is higher or stronger thanthat in the south of Zhejiang province. Formation of the biogas were controlled by seven main factors, namely depositional environ-went, depositional time, paleoclimate, sea level change, crustal subsidence, rate of deposition and water medium. It's favorableinfluence to mass production and enrichment of biogas in flood land facies gas source rock, when these factors interact and influenceeach other.
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Key words:
- Zhejiang /
- Holocene /
- gas source rock /
- biogas /
- controlling factors
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