本文選題：熱演化史　切入點(diǎn)：生烴史　出處：《西安石油大學(xué)》2017年碩士論文

【摘要】：準(zhǔn)噶爾盆地南緣勘探程度較低,尚未有規(guī)模性的發(fā)現(xiàn),按照成藏地質(zhì)條件的類比,準(zhǔn)南前陸沖斷帶下組合是準(zhǔn)南前陸盆地可能取得重大戰(zhàn)略突破的潛在領(lǐng)域。本文在調(diào)研準(zhǔn)南復(fù)雜構(gòu)造帶成藏研究成果的基礎(chǔ)上,綜合利用地質(zhì)、鉆井、地震、分析化驗(yàn)等基礎(chǔ)資料,以單井實(shí)測(cè)地溫、Ro數(shù)據(jù)為約束,以單井和三維盆地模擬為技術(shù)手段,以烴源巖的成烴演化分析為研究重點(diǎn),通過對(duì)準(zhǔn)南多套烴源巖的空間分布、熱演化以及生烴史的分析,結(jié)合現(xiàn)今油氣來源及分布特征,進(jìn)行有效烴源巖及有效生烴區(qū)劃分,從烴源巖熱演化生烴史的角度去解釋準(zhǔn)南緣不同構(gòu)造帶或地區(qū)的油氣來源、成藏匹配條件及油氣分布的差異,深化準(zhǔn)南前陸盆地?zé)N源巖對(duì)油氣分布規(guī)律的控制作用的認(rèn)識(shí),以期為下一步的勘探部署提供了指導(dǎo)性建議。通過以上研究主要取得以下幾點(diǎn)創(chuàng)新性認(rèn)識(shí):1、準(zhǔn)南地溫梯度較低,僅為1.5~2.2℃/100m,地溫梯度整體低于18℃/km,現(xiàn)今地表熱流值低于35mW/m2,往南部山前帶地溫梯度逐漸降低,遠(yuǎn)低于準(zhǔn)噶爾腹部、西北緣和東部。低地溫有利于烴源巖生烴潛力的保持和晚期生烴。2、根據(jù)實(shí)測(cè)數(shù)據(jù)檢驗(yàn)和單井、三維盆地模擬,結(jié)合油氣源對(duì)比結(jié)果,認(rèn)為準(zhǔn)南前陸發(fā)育三套有效烴源巖,分別為二疊系、中-下侏羅統(tǒng)以及白堊系清水河組烴源巖。由于熱演化程度低,安集海河組烴源巖為無效烴源巖,準(zhǔn)南四棵樹凹陷原油應(yīng)來自于侏羅系烴源巖,而非之前認(rèn)為的來自于E烴源巖。3、準(zhǔn)南不同區(qū)帶構(gòu)造-埋藏史、熱演化史差異巨大,可劃分為四種類型:Ⅰ晚期抬升剝蝕型(齊古斷褶帶)、Ⅱ持續(xù)埋藏型(烏奎背斜帶)、Ⅲ晚期緩慢埋藏型(前陸斜坡帶)、Ⅳ早期淺埋晚期快速埋藏型(四顆樹凹陷帶)。4、根據(jù)已發(fā)現(xiàn)的來自于侏羅系烴源巖的油氣分布,表明侏羅系烴源巖為準(zhǔn)南地區(qū)的主力烴源巖,并且廣泛分布。準(zhǔn)南侏羅系來源油氣分布具有中段富氣,西段油氣共存,東段富油的特征,從西向東,烴源巖成熟度具有先增加后減小的規(guī)律,天然氣的成熟度也具有同樣的變化規(guī)律,表明烴源巖成熟度對(duì)油氣組成和油氣成熟度具有明顯的控制作用。
[Abstract]:The southern margin of Junggar basin is low in exploration degree and has not yet been found on a large scale. According to the analogy of reservoir forming geological conditions, the sub-assemblage of the quasi-southern Foreland thrust belt is the potential area for the major strategic breakthrough in the quasi-southern Foreland basin.On the basis of investigating and researching the reservoir formation of the complex tectonic belt in the southern part of China, this paper synthetically utilizes the basic data such as geology, drilling, earthquake, analysis and laboratory analysis, taking the Ro data measured by single well as the constraint, and taking the simulation of single well and three dimensional basin as the technical means.Based on the analysis of hydrocarbon generation evolution of source rocks, through the analysis of spatial distribution, thermal evolution and hydrocarbon generation history of several sets of source rocks in South China, the effective source rocks and effective hydrocarbon generation areas are divided according to the present source and distribution characteristics of oil and gas.From the point of view of hydrocarbon generation history of thermal evolution of source rocks, this paper explains the source of oil and gas in different structural zones or areas in the southern margin of the quasi southern margin, the matching conditions of oil and gas accumulation and the difference of oil and gas distribution, and deepens the understanding of the controlling effect of source rocks on the distribution of oil and gas in the quasi southern Foreland basin.In order to provide guidance for the next exploration deployment.Through the above research, we have mainly obtained the following innovative understandings: 1: 1, the quasi-southern geothermal gradient is relatively low, only 1.5% 2.2 鈩，

本文編號(hào)：1702379