全文: ? HTML (1 KB)?

文章導(dǎo)讀??

摘要? 西湖凹陷平湖斜坡帶北部孔雀亭含油構(gòu)造油氣資源豐富，但成藏過(guò)程復(fù)雜,，其油氣來(lái)源和充注過(guò)程尚不明確,。通過(guò)油源對(duì)比及流體包裹體巖相學(xué)、均一溫度,、鹽度,、結(jié)合激光拉曼測(cè)試等多種方法，對(duì)孔雀亭構(gòu)造油氣來(lái)源,、油氣充注期次和成藏時(shí)間進(jìn)行了分析,。研究表明孔雀亭地區(qū)烴源巖主要分布在古近系始新統(tǒng)沉積的平湖組、寶石組地層,，烴源巖類(lèi)型包括煤,、碳質(zhì)泥巖和泥巖，有機(jī)質(zhì)類(lèi)型為Ⅱ1—Ⅱ2 型,；平湖組上,、中、下段和寶石組烴源巖總有機(jī)碳含量(TOC),、生烴潛力(S1+S2),、氫指數(shù)(HI)等指標(biāo)有所差異,，其中平下段烴源巖有著較高的總有機(jī)碳含量；平湖組,、花港組砂體多層系含油,，油氣地球化學(xué)性質(zhì)均有差異，油源對(duì)比顯示該區(qū)油氣可劃分為 2 類(lèi),，Ⅰ類(lèi)較低成熟度的油氣來(lái)源于孔雀亭地區(qū)中低帶平湖組下段烴源巖,，Ⅱ類(lèi)較高成熟度的油氣可能來(lái)源于中低帶寶石組烴源巖；平湖組儲(chǔ)層發(fā)育 2 期流體包裹體,，第 1 期氣液兩相包裹體發(fā)黃色,、黃綠色、藍(lán)綠色熒光,，因經(jīng)歷再平衡作用,，認(rèn)為其捕獲均一溫度為 130~140 °C，成藏時(shí)期為 5~2 Ma,，以輕質(zhì)油和凝析油充注為主,；第 Ⅱ期天然氣包裹體呈灰色，無(wú)熒光顯示,，未經(jīng)歷再平衡作用,，結(jié)合主峰均一溫度 140~150 °C，認(rèn)為成藏時(shí)期為 2 Ma至今,，以天然氣充注為主,，呈現(xiàn)晚期充注特征。激光拉曼檢測(cè)到包裹體中含有瀝青質(zhì),，推測(cè)晚期可能伴有氣洗作用。研究認(rèn)為孔雀亭構(gòu)造油氣主要成藏時(shí)間為三潭組沉積至今,，具備優(yōu)良的儲(chǔ)蓋組合與構(gòu)造演化的時(shí)空配置,，具有“早油晚氣，晚期成藏”的充注特點(diǎn),。

	服務(wù)

	把本文推薦給朋友
	加入我的書(shū)架
	加入引用管理器

關(guān)鍵詞 ：孔雀亭構(gòu)造,；油源對(duì)比,；流體包裹體；均一溫度,；鹽度,；激光拉曼；成藏期次

Abstract：

The Kongqueting oil-bearing structure located in the north of the Pinghu slope belt in the Xihu Depression has abundant oil and gas resources, but the process of hydrocarbon accumulation is complicated, and the oil and gas sources and

charging processes are still unclear. The sources, charging periods and accumulation time of oil and gas in the Kongqueting structure were investigated by means of oil—source correlation, petrography, homogenization temperature, salinity of fluid

inclusions and laser Raman measurement. The results show that source rocks are mainly distributed in the Eocene Pinghu and Baoshi Formations. Source rocks include coal, carbonaceous mudstone and mudstone, and the organic matter type is Ⅱ 1 — Ⅱ 2 . The total organic carbon content ( TOC ), hydrocarbon generation potential ( S 1 + S 2 ) and hydrogen index ( HI ) of source rocks of Upper, Middle and Lower Pinghu Formations and Baoshi Formations are different. Source rocks of the Lower Pinghu Formations have higher total organic carbon content. The sandbodies of the Pinghu and Huagang Formations are multi-layer oil-bearing systems, and the geochemical properties of the oil and gas are different. The oil-source correlation shows that the oil and gas in this area can be divided into two type: the oil and gas with lower maturity of type I are derived from source rocks of the lower Pinghu Formation in the middle and lower belts in the Kongqueting area, while the oil and gas with higher maturity of type II may be derived from the source rocks of the middle and lower belts of the Baoshi Formation. The fluid inclusions in the Pinghu Formation develop two stages: In the first phase, the gas-liquid two-phase inclusions fluoresce in yellow, yellow-green and blue green. Due to the special geologic processes, the capture homogenization temperature was 130~140 °C, and the accumulation period was 5~2 Ma, which was dominated by light oil and condensate oil charging. The natural gas inclusions of the second stage were gray with no fluorescence display and had not experience the special geologic processes. Combined with the main peak homogenization temperature of 140~150 °C, it was considered that the hydrocarbon accumulation period was 2 Ma till now, featured as natural gas charging, showing the characteristics of late charging. Asphaltene in the inclusions was detected by laser Raman and it is speculated that there may have been gas washing in the late stage. The study shows that the main time of hydrocarbon accumulation in the Kongqueting structure is from the deposition of the Santan Formation up to the present day. It has a good spatiotemporal arrangement of reservoir-cap assemblage and structural evolution, and has the charging characteristics of “early oil, late gas and late accumulation”.

Key words： Kongqueting Structure; oil source correlation; fluid inclusion; homogenization temperature; salinity; laser Raman; accumulation period time

收稿日期: 2021-06-30 ????

PACS:

?

基金資助:中國(guó)地質(zhì)大學(xué)( 北京) 基本科研業(yè)務(wù)費(fèi)(35832019035) 和國(guó)家科技重大專(zhuān)項(xiàng)(2016ZX05027001-003) 資助

通訊作者: [email protected]

引用本文: ??

李朝陽(yáng), 魏琳, 刁慧, 程熊, 侯讀杰. 西湖凹陷孔雀亭構(gòu)造平湖組油氣來(lái)源及充注特征. 石油科學(xué)通報(bào), 2021, 02: 196-208 LI Chaoyang, WEI Lin, DIAO Hui, CHENG Xiong, HOU Dujie. Hydrocarbon source and charging characteristics of the Pinghu Formation in the Kongqueting Structure, Xihu Depression. Petroleum Science Bulletin, 2021, 02: 196-208.

鏈接本文: ?

?