矿物岩石地球化学通报
礦物巖石地毬化學通報
광물암석지구화학통보
BULLETIN OF MINERALOGY PETROLOGY AND GEOCHEMISTRY
2015年
3期
626-632
,共7页
张兴雅%赵龙%党思思%孙平安%曹剑
張興雅%趙龍%黨思思%孫平安%曹劍
장흥아%조룡%당사사%손평안%조검
湖相烃源岩%油源%生物标志物%盐湖有机质%含油气系统
湖相烴源巖%油源%生物標誌物%鹽湖有機質%含油氣繫統
호상경원암%유원%생물표지물%염호유궤질%함유기계통
lacustrine source rock%oil-source%biomarker%saline lacustrine organic matter%petroleum system
准噶尔盆地白垩系含油气系统理论上具备一定的勘探能力，但研究程度较低。为加深对该问题的理解，分析了白垩系的烃源岩和原油地球化学特征，并进一步结合地质背景，探讨了勘探潜力。结果发现，白垩系发育有一定数量和规模的泥质烃源岩，存在有机碳 TOC 含量大于1．0％的样品，类型以Ⅱ型为主，目前主体处于低成熟—成熟演化阶段，因此可望具有一定的生烃，特别是生油潜力。油源对比发现白垩系的确有过原油生成，典型地球化学特征表现为轻碳同位素（－29．6‰～－27．9‰）、低 Pr／Ph 值（0．54～1．01）、高伽马蜡烷丰度（伽马蜡烷／C 30藿烷＝0．29～0．53），反映属于一类还原和盐度环境中有机质所生原油。这类原油主要分布在盆地南缘白垩系烃源岩的沉积中心区，表现出源控特征。这些认识可供国内外其他白垩系油气地质研究时类比考察。
準噶爾盆地白堊繫含油氣繫統理論上具備一定的勘探能力，但研究程度較低。為加深對該問題的理解，分析瞭白堊繫的烴源巖和原油地毬化學特徵，併進一步結閤地質揹景，探討瞭勘探潛力。結果髮現，白堊繫髮育有一定數量和規模的泥質烴源巖，存在有機碳 TOC 含量大于1．0％的樣品，類型以Ⅱ型為主，目前主體處于低成熟—成熟縯化階段，因此可望具有一定的生烴，特彆是生油潛力。油源對比髮現白堊繫的確有過原油生成，典型地毬化學特徵錶現為輕碳同位素（－29．6‰～－27．9‰）、低 Pr／Ph 值（0．54～1．01）、高伽馬蠟烷豐度（伽馬蠟烷／C 30藿烷＝0．29～0．53），反映屬于一類還原和鹽度環境中有機質所生原油。這類原油主要分佈在盆地南緣白堊繫烴源巖的沉積中心區，錶現齣源控特徵。這些認識可供國內外其他白堊繫油氣地質研究時類比攷察。
준갈이분지백성계함유기계통이론상구비일정적감탐능력，단연구정도교저。위가심대해문제적리해，분석료백성계적경원암화원유지구화학특정，병진일보결합지질배경，탐토료감탐잠력。결과발현，백성계발육유일정수량화규모적니질경원암，존재유궤탄 TOC 함량대우1．0％적양품，류형이Ⅱ형위주，목전주체처우저성숙—성숙연화계단，인차가망구유일정적생경，특별시생유잠력。유원대비발현백성계적학유과원유생성，전형지구화학특정표현위경탄동위소（－29．6‰～－27．9‰）、저 Pr／Ph 치（0．54～1．01）、고가마사완봉도（가마사완／C 30곽완＝0．29～0．53），반영속우일류환원화염도배경중유궤질소생원유。저류원유주요분포재분지남연백성계경원암적침적중심구，표현출원공특정。저사인식가공국내외기타백성계유기지질연구시류비고찰。
The Cretaceous petroleum system in the Junggar Basin holds exploration potential theoretically,but has relative-ly limited research.In order to provide basic data for petroleum exploration of the Cretaceous petroleum system in the Jung-gar Basin,this paper studied the potential hydrocarbon resources by comprehensive geochemical analyses on source rocks and crude oils in combination with geological background.Analytical results indicated that the Cretaceous strata hosted a certain number of source rocks,whose TOC contents are greater than 1.0%,organic matters are mainly type II kerogen and currently are lowly mature to mature.The Cretaceous is expected to have certain hydrocarbon,especially oil-generation potential.The oil-source correlation supports this conclusion.The representative Cretaceous-derived oils have main geo-chemical characteristics as follows:light carbon isotopes (-29.6‰ ~-27.9‰),low Pr /Ph values (0.54-1.01),high gammacerane abundance (gammacerane /C 30 hopane =0.29-0.53).These reflected that the oils were formed in reducing and saline environment.Cretaceous-sourced oils distributed mainly in the southern margin of the basin,in particular the sedimentary center of the Cretaceous source rocks,showing the source-control characteristics.In summary,the petroleum exploration of the Cretaceous petroleum system in the Junggar Basin should be focused on oil and in the southern basin margin.These results and understandings can also be referred by other studies relevant to Cretaceous hydrocarbon geology.
