DIFFERENCE IN GAS SOURCES FOR OFFSHORE AND ONSHORE MUD VOLCANOES IN MAKRAN ACCRETIONARY WEDGE
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摘要:
为了探讨马克兰增生楔海陆泥火山气源成因及其差异，对取自陆上钱达戈普(Chandargup)泥火山口的5个水样进行了气体组分及其碳、氢同位素测试。结果显示，陆上泥火山中的气体组分主要为CH4和CO2，其CH4碳同位素平均值为-42‰，属热解成因气。对比分析马克兰增生楔海陆沉积地层、断裂分布、地温梯度、有机质含量等资料，认为海域与泥火山有关的生物成因气主要来自于浅表层的Hinglaj-Ormara组泥岩，而陆域热解成因气主要来自深部的Hoshab组页岩或者更深处泥页岩，推测马克兰增生楔陆域深部地层有一定的油气资源潜力。
Abstract:In order to investigate the origin of mud volcanic gas source in Chandargup area of the Makran accretionary wedge and the differences between onshore and offshore mud volcanic gas sources, the gas composition and carbon and hydrogen isotopes of five water samples from onshore mud volcanic crater were tested. The results show that the gas components in the onshore mud volcano are mainly composed of methane and carbon dioxide, and the average carbon isotope of methane is -42‰, indicating an origin of thermogenic gas. By collecting the data of sedimentary strata, fault distribution, geothermal gradient and organic matter content onshore and offshore of the Makran accretionary wedge, it is concluded that the biogenic gas related to offshore mud volcanoes mainly comes from shallow Hinglaj-Ormara mudstone, while the onshore thermogenic gas mainly from deep Hoshab shale or deeper mudstone and shale, indicating that there is a potential for oil and gas resources in the deep strata of the onshore Makran accretionary wedge.
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表 1 泥火山水样中气体组分及C、H同位素测试结果
Table 1. Gas content and C and H isotopes from water samples of mud volcano
样品编号 CH4/% CO2/% CH4 /%
相对含量CO2/%
相对含量δ13C-CH4/‰ δD-CH4/‰ δ13C-CO2/‰ 1-1 * * * * * * -0.17 1-2 0.06 0.30 17 83 * * -4.78 1-3 0.57 0.29 66 34 -44.12 -289 -1.48 1-4 0.20 0.23 47 53 -37.44 -249 -0.62 1-5 0.12 0.34 26 74 -45.95 -264 -1.89 
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表 2 增生楔海域和陆域地层、岩性、地温梯度、TOC含量等分布
Table 2. The stratigraphic distribution of strata, lithology, geothermal gradient and TOC content in the onshore and offshore Makran accretionary wedge
年代 海域地层 岩性 地层厚度/km 地温梯度/℃ TOC/% 中新世以来层序Ⅰ和Ⅱ Hinglaj-Ormara组 泥岩 >2 25 >1(OMZ) Parkini组 粉砂质沉积 渐新世-中中新世层序Ⅲ Panjgur组 上部砂、下部
泥质沉积Hoshab组 年代 陆域地层 岩性 地层厚度/km 地温梯度/℃ TOC/% 上新世-更新世 Chitti/Ormara组 细粉砂岩 2-3 25 上新世 Talar/Hinglaj组 浅灰色泥岩 晚中新世 Parkini组 泥岩 1 0.64 Panjgur组 砂岩 >2 渐新世-中中新世 Hoshab组 页岩 0.54
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