本文選題：頁巖氣 + 武陵坳陷　； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：頁巖氣是一種非常重要的非常規(guī)天然氣資源,其勘探開發(fā)新理論、新技術(shù)和產(chǎn)量的突破將是本世紀(jì)各國競相爭奪的高地,對保障我國能源安全和經(jīng)濟(jì)高速發(fā)展具有非常重要的戰(zhàn)略意義。本文主要針對川東武陵山地區(qū)龍馬溪組,兼顧五峰組泥頁巖進(jìn)行研究,通過開展野外露頭剖面實測、主微量元素測試分析、地震資料解釋等工作,并以巖石礦物室內(nèi)試驗為手段,綜合分析影響頁巖氣成藏的地質(zhì)條件,尋找頁巖氣發(fā)育甜點區(qū)。研究區(qū)經(jīng)受過多期次構(gòu)造抬升和剝蝕作用,形成了獨特的隔擋隔槽式的地形地貌,斷裂和裂縫發(fā)育。為了給川東武陵山地區(qū)頁巖氣勘探開發(fā)提供科學(xué)依據(jù),本文主要分析了泥頁巖的沉積環(huán)境、泥頁巖空間展布特征、烴源巖有機(jī)地化特征、儲集空間類型、含氣性以及頁巖氣的保存條件等。通過廣泛的野外調(diào)查和地層對比分析,川東武陵山地區(qū)上奧陶統(tǒng)五峰組和下志留統(tǒng)龍馬溪組黑色頁巖地層普遍發(fā)育。利用稀土元素分配模式圖和微量元素判別圖解證明沉積物源來自上地殼,沉積構(gòu)造背景以活動大陸邊緣為主。沉積相標(biāo)志和地球化學(xué)元素分析表明五峰-龍馬溪組黑色泥頁巖大多發(fā)育于缺氧環(huán)境,具有較高的古生產(chǎn)力和生烴潛力。上奧陶統(tǒng)五峰組以斜坡相沉積為主,下志留統(tǒng)龍馬溪組以深水陸棚-淺水陸棚沉積為主,深水陸棚相為優(yōu)勢沉積環(huán)境。龍馬溪組優(yōu)質(zhì)頁巖主要分布在龍馬溪組底部,泥頁巖平面展布由北西向南東方向逐漸增厚,以習(xí)水-桐梓和秀山-酉陽一帶為沉降中心,厚度60~120米�？傮w埋深1500~4500米,最佳埋深為2500~3500米,優(yōu)勢區(qū)域集中在貴北地區(qū)道真-正安一帶。龍馬溪組頁巖有機(jī)質(zhì)母巖來源于低等水生生物,有機(jī)質(zhì)類型以Ⅰ和Ⅱ1型干酪根為主。有機(jī)質(zhì)豐度含量變化較大,TOC范圍在0.11%~5.04%之間,平均值為1.88%。熱演化程度高,Ro在2%~4%之間,總體達(dá)到高-過成熟階段,表現(xiàn)出了良好的頁巖氣成藏地球化學(xué)特征。孔隙度和滲透率都極低,屬于低孔低滲氣藏。泥頁巖現(xiàn)場解析氣小于1m3/t,等溫吸附氣含氣量在1.53m3/t~4.76 m3/t之間,具有較好的吸附能力。采用多種地震屬性識別五峰-龍馬溪組頁巖的裂縫發(fā)育區(qū),確定向斜是頁巖氣藏發(fā)育的有利位置。通過繪制研究區(qū)泥頁巖厚度、有機(jī)碳含量、成熟度、埋藏深度平面分布等值圖,運用多因素疊加分析法優(yōu)選出習(xí)水-桐梓-正安一帶和秀山-酉陽-咸豐一帶為資源潛力有利區(qū)。
[Abstract]:Shale gas is a very important unconventional natural gas resource. The breakthrough of new theory, new technology and production of shale gas will be the high ground competing for each other in this century. It is of great strategic significance to ensure the energy security and rapid economic development of our country. This paper mainly focuses on the Longmaxi formation in Wulingshan area of East Sichuan, and takes into account the mud shale of Wufeng formation. Through the field outcrop profile measurement, the analysis of main and trace elements, the interpretation of seismic data, and so on, Based on the laboratory test of rock and minerals, the geological conditions affecting the formation of shale gas reservoir are analyzed synthetically, and the desserts area of shale gas development is found. The study area has been subjected to multiple tectonic uplift and denudation, resulting in the formation of a unique barrier channel landform, fracture and fracture development. In order to provide scientific basis for shale gas exploration and development in Wulingshan area, East Sichuan, this paper mainly analyzes the sedimentary environment of shale, the spatial distribution characteristics of shale, the organic geochemical characteristics of hydrocarbon source rocks, and the types of reservoir space. Gas bearing and the preservation conditions of shale gas. Through extensive field investigation and stratigraphic correlation analysis, the black shale strata of Wufeng formation of Upper Ordovician and Longmaxi formation of Lower Silurian in Wulingshan area of East Sichuan are generally developed. The REE distribution pattern map and trace element discriminant diagram show that the sediment source comes from the upper crust and the sedimentary tectonic background is mainly active continental margin. The analysis of sedimentary facies and geochemical elements shows that the black shale of Wufeng-Longmaxi formation is mostly developed in anoxic environment with high paleoproductivity and hydrocarbon generation potential. The upper Ordovician Wufeng formation is dominated by slope facies, the lower Silurian Longmaxi formation is dominated by deep-water shelf and shallow water shelf, and the deep-water shelf facies is the dominant sedimentary environment. The high quality shale of Longmaxi formation is mainly distributed at the bottom of Longmaxi formation, and the distribution of shale is gradually thickening from north to west to south to east, with Xishui Tongzi and Xiushan-Youyang as the subsidence center, with a thickness of 60 ~ 120 meters. The total buried depth is 1500 ~ 4500 meters, and the optimum buried depth is 2500 ~ 3500 meters. The dominant area is concentrated in the area of Daozhen-Zhengan in the north of Guizhou. The source rocks of shale organic matter in Longmaxi formation are from low aquatic organisms, and the main types of organic matter are type 鈪，

本文編號：1916058