(1. 中南大學(xué) 有色金屬成礦預(yù)測(cè)教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083；
3. 中國(guó)石油長(zhǎng)慶油田分公司 采油二廠，慶城 745100)
摘 要: 馬嶺油田位于鄂爾多斯盆地陜北斜坡帶的西南部，是鄂爾多斯盆地發(fā)現(xiàn)最早的油田之一。通過(guò)對(duì)鄂爾多斯盆地馬嶺油田南部原油進(jìn)行系統(tǒng)的GC和GC/MS分析，揭示原油的生物標(biāo)志化合物組成特征及其來(lái)源，建立油藏成藏模式。結(jié)果顯示：所分析的原油屬于同一成因類(lèi)型，原油有機(jī)母質(zhì)為混合型，高等植物和水生生物為原油的形成作出了重要貢獻(xiàn)；原油形成于弱還原和淡水−微咸水環(huán)境；原油成熟度高，主要是生油高峰期形成的石油；原油來(lái)自長(zhǎng)7烴源巖，在延安組和延長(zhǎng)組形成下生上儲(chǔ)型或自生自?xún)?chǔ)型含油組合。
關(guān)鍵字: 馬嶺油田；原油；地球化學(xué)特征；生物標(biāo)志化合物；成藏模式
southern Maling oilfield
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Second Production Plant, Changqing Oilfield Company of Petrochina, Qingcheng 745100, China）
Abstract:Maling oilfield is located in the southwest part of the Shanbei incline, Ordos Basin, which is one of the earliest discovered oilfields in this area. Systematic analysis on the crude oil in the southern Maling oilfield of Ordos Basin by using GC and GC/MS was carried out, the biomarkers compositions and sources of the crude oil were revealed, and the reservoir forming model was established. The results show that the oil belongs to the same genetic type and the oil-forming matrixes are mixed, and higher plants and aquatic organisms make important contributions. The crude oil forms in the weak reducing and fresh water environments, and generates predominately in the peak period of oil generating with high maturity. The crude oil is derived from the Chang-7 source rocks, and forms the combination pattern of self-generating and self-accumulating or lower-generating and upper-reservoiring in Yanchang formation and Yan’an formation.
Key words: Maling oilfield; crude oil; geochemical characteristic; biomarker; reservoir forming model
