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摘要? 為了系統(tǒng)深入的研究南華北盆地太康隆起和蚌埠隆起上古生界山西組砂巖的氣體來(lái)源,、成巖階段與成藏過(guò)程,，本文采用伊利石的結(jié)晶度、流體包裹體巖相學(xué),、顯微激光拉曼測(cè)試技術(shù),，結(jié)合稀有氣體同位素，對(duì)砂巖的成巖階段,，致密砂巖氣體的成藏過(guò)程,、氣體來(lái)源和貢獻(xiàn)率進(jìn)行了詳細(xì)的研究。砂巖中伊利石結(jié)晶度介于 0.64~1.06(△2θ)之間,，指示早—中成巖階段,；I/S混層中蒙皂石含量范圍為 0%~50%，指示中成巖階段A-B期,；流體包裹體均一溫度分布在 110~120 ℃和 130~150 ℃兩個(gè)范圍內(nèi),，同樣指示中成巖階段A-B期,。綜合伊利石的結(jié)晶度,、I/S混層中蒙皂石含量和古溫度三種研究方法，共同界定南華北盆地山西組致密砂巖成巖作用階段為中成巖階段A-B期,。通過(guò)流體包裹體巖相學(xué)觀察結(jié)合顯微激光拉曼測(cè)試技術(shù),，準(zhǔn)確確定包裹體的類(lèi)型、成分和世代關(guān)系等,，確定油氣成藏期次為 1 期,。利用含烴鹽水包裹體的均一溫度，將之“投影”到附有古地溫演化的埋藏史圖中,，確定山西組致密砂巖氣的成藏時(shí)間為印支期末期—燕山期早期,。利用稀有氣體同位素 40Ar/36Ar值,，計(jì)算氣源巖年齡，確定山西組致密砂巖中的天然氣來(lái)自于石炭—二疊紀(jì),。按照泥頁(yè)巖,、煤巖二端元混合模型，計(jì)算了不同烴源巖產(chǎn)生的天然氣對(duì)砂巖樣品中天然氣的貢獻(xiàn)率,，結(jié)果表明南華北盆地山西組致密砂巖中天然氣的主力烴源巖為煤系泥頁(yè)巖,，貢獻(xiàn)率約為 73.5%；煤巖在整個(gè)生烴過(guò)程中發(fā)揮次要作用,，貢獻(xiàn)率約為 26.5%,。

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關(guān)鍵詞 ：成巖階段,；成藏；致密砂巖氣,；稀有氣體同位素,；南華北盆地

Abstract：

In order to systematically and deeply study the gas source, diagenesis stage and accumulation process of the upper

Paleozoic Shanxi Formation in Taikang and the Bengbu Uplift in the Southern North China Basin, this paper adopted the crystal

linity of illite, fluid inclusion petrography, and Micro-Laser Raman, combined with rare gas isotopes, which provides a detailed

study of the diagenesis stage of sandstone, the accumulation process of tight sandstone gas and its source and contribution rate.

The crystallinity of illite in the sandstone ranges from 0.64 to 1.06 ( △ 2θ), indicating an early to middle diagenesis stage. The

smectite content in the I/S mixed layer ranges from 0 to 50 % , indicating a middle diagenetic stage A-B. The temperature of fluid

inclusions is in two ranges of 110~120 ℃ and 130~150 ℃, which also indicates in the middle diagenetic stage A-B. Integrating

the three research methods of illite crystallinity, smectite content in mixed layer I/S and paleo-temperature, the diagenesis

stage of tight sandstone in the Shanxi Formation is in the middle diagenetic stage A-B. Through fluid inclusion petrographic

observations combined with Micro-laser Raman testing, the type, composition, and generation relationship of the inclusions

are accurately determined, and there is only one hydrocarbon accumulation period. Using the homogenization temperatures

of the hydrocarbon-bearing brine inclusions, “projecting” these onto the burial history map with paleotemperature evolution,

the accumulation time of tight sandstone gas in the Shanxi Formation is determined to be the end of the Indosinian to the early

Yanshan period. By using rare gas isotope 40 Ar/ 36 Ar values to calculate the age of the gas source rock, it is determined that the

natural gas in tight sandstone in the Shanxi Formation comes from the Carboniferous-Permian. According to the mud shale and

coal rock two-end-member mixing model, the contribution rate of natural gas produced by different source rocks to natural gas in

sandstone samples was calculated. The results indicate that the main source rock of natural gas in tight sandstone of the Shanxi

Formation in the southern north China Basin is the mud shale, and the contribution rate of shale is about 73 % . Coal rock plays a

secondary role in the entire hydrocarbon generation process, and the contribution rate is about 27 % .

Key words： diagenesis stage; accumulation; tight sandstone gas; rare gas isotope; southern north China Basin

收稿日期: 2021-09-29 ????

PACS:

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基金資助:國(guó)家科技重大專(zhuān)項(xiàng)“不同類(lèi)型頁(yè)巖氣生成機(jī)理及富集規(guī)律研究”(2016ZX05034-001) 資助

通訊作者: [email protected]

引用本文: ??

劉瑞, 郭少斌, 屈凱旋, 郭予斌. 南華北盆地山西組砂巖的氣體來(lái)源、成巖階段與成藏過(guò)程研究. 石油科學(xué)通報(bào), 2021, 03: 356-368 LIU Rui, GUO Shaobin, QU Kaixuan, GUO Yubin. Study of gas source, diagenesis stage and accumulation process of the sandstone of the Shanxi Formation in the southern north China Basin. Petroleum Science Bulletin, 2021, 03: 356-368.

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