本文選題：武威盆地 + 石炭系�。� 參考：《西安石油大學》2017年碩士論文

【摘要】：武威盆地位于河西走廊東部,是祁連—阿拉善地區(qū)石炭系發(fā)育和保存較好的地區(qū)之一,具有良好的油氣地質條件。石炭系為一套海陸過渡相沉積,是盆地主要烴源巖層,石炭系地層發(fā)育完整,從下至上依次為前黑山組、臭牛溝組、靖遠組、羊虎溝組和太原組,烴源巖主要為灰黑色泥、頁巖和灰?guī)r。本文通過對武威盆地野外露頭剖面和探井剖面系統(tǒng)采樣,采用有機地球化學測試技術和分析方法,建立野外露頭綜合地球化學剖面,對武威盆地石炭系烴源巖的有機質豐度、類型、成熟度和生物標志化合物等特征進行全面分析,并結合前人研究基礎探討盆地烴源巖有機質生源及其沉積環(huán)境。武威盆地石炭系烴源巖有機質豐度普遍較高,干酪根碳同位素組成分布于-20.1‰--26.5‰之間,有機質類型主要為Ⅲ型干酪根,少數(shù)為Ⅱ2型干酪根。不同層段烴源巖樣品的最高熱解峰溫Tmax普遍超過了435℃,成熟度較高,處于高成熟熱演化階段。石炭系烴源巖正構烷烴以前高后低的雙峰型為主,正構烷烴∑nC21-/∑nC22+主要分布在0.8-2.0之間,以飽和烴輕質組分為主,從下石炭統(tǒng)—上石炭統(tǒng)烴源巖生源從低等水生生物向陸相高等植物生源過渡。武威盆地烴源巖Pr/Ph值主要分布在0.5左右,Pr/nC17值主要分布0.53 1.0之間,Ph/nC18值主要分布范圍為1.0 1.6之間,表明以植烷占優(yōu)勢的弱還原—還原環(huán)境為主。下石炭統(tǒng)的源巖以ααα20RC27甾烷占絕對優(yōu)勢特征,呈現(xiàn)正“L”型,孕甾烷類化合物含量較高,至上石炭統(tǒng)呈現(xiàn)“V”型,孕甾烷類化合物含量有所下降;C19—C23三環(huán)萜烷基本呈上升-下降-再上升趨勢,Ts含量較Tm的相對含量接近,伽瑪蠟烷含量較高;石炭系烴源巖菲、芘、屈類化合物含量高,而萘、蒽、惹烯、傒等多環(huán)芳香類化合物相對含量較低;芴系列化合物整體處于過渡環(huán)境,盆地石炭系沉積由還原環(huán)境向弱氧化環(huán)境過渡,生物源構成由低等水生生物向陸源高等植物過渡。
[Abstract]:Wuwei Basin is located in the eastern part of Hexi Corridor. It is one of the areas where the Carboniferous system is well developed and preserved in Qilian-Alashan area and has good oil and gas geological conditions. Carboniferous is a set of marine and continental transitional facies sedimentary, which is the main source rock in the basin. The Carboniferous strata are well developed. From the bottom to the top, they are the Qianheishan formation, the stinuigou formation, the Jingyuan formation, the Yanghugou formation and the Taiyuan formation, and the source rocks are mainly gray mud. Shale and limestone. By sampling the outcrop profile and exploration section system in Wuwei Basin, the organic geochemical testing technique and analysis method are used to establish the outcrop comprehensive geochemical profile in the field, and the abundance of organic matter in the Carboniferous source rocks in Wuwei Basin is studied. The types, maturity and biomarker compounds were comprehensively analyzed, and the source of organic matter and its sedimentary environment of source rocks in the basin were discussed based on previous studies. The abundance of organic matter in Carboniferous source rocks in Wuwei Basin is generally high, and the kerogen carbon isotopic compositions range from -20.1 鈥，

本文編號：1788639