【摘要】：中國南方地區(qū)下志留統(tǒng)龍馬溪組富有機質頁巖與美國阿巴拉契亞盆地中泥盆統(tǒng)Marcellus頁巖,在形成構造背景、沉積環(huán)境方面具有一定的相似性,均形成于前陸盆地構造背景下的陸棚-斜坡淺海,沉積環(huán)境具有半封閉性。同時,二者也存在一定差異性,Marcellus頁巖形成于前陸盆地早期快速沉降階段斜坡帶,其后期經(jīng)歷的構造變形相對較弱;中國南方龍馬溪組頁巖形成于前陸盆地持續(xù)沉降背景下,但其后期經(jīng)歷的構造改造作用多期復雜,其中四川盆地處于距離造山帶較遠的隆后凹陷構造位置,其除經(jīng)歷了頻繁的升降運動外,擠壓、拉張改造相對其周緣地區(qū)較弱。二者在具體地質特征方面也具有一定差異,主要表現(xiàn)在龍馬溪組頁巖埋藏較深、有效厚度大、熱演化程度相對較高以及有機質含量相對較低。二者形成沉積構造背景以及地質特征的對比研究,對中國南方志留系龍馬溪組頁巖氣進一步的勘探評價以及研究工作具有重要的指導意義。
[Abstract]:The organic shale of the Lower Silurian Longmaxi formation and the Marcellus shale of the Middle Devonian in the Appalachia Basin in southern China are similar in tectonic setting and sedimentary environment. All of them are formed in the Foreland basin tectonic setting, the continental shelf-slope shallow sea, and the sedimentary environment is semi-closed. At the same time, there are some differences between them. Marcellus shale was formed in the slope zone of early rapid subsidence stage of Foreland basin, and its tectonic deformation was relatively weak in the later stage, and the shale of Longmaxi formation in southern China was formed in the context of continuous subsidence of Foreland basin. However, the late stage of tectonic transformation is complicated, and Sichuan basin is located in the structural position of Longhou depression far from the orogenic belt, which, in addition to the frequent ascending and descending movements, compresses and compresses, and the extensional reconstruction is weaker than the surrounding area. There are also some differences in the specific geological characteristics between the two formations, which mainly show that the shale of Longmaxi formation is buried deep, the effective thickness is large, the thermal evolution degree is relatively high, and the content of organic matter is relatively low. The comparative study of the sedimentary tectonic background and geological characteristics between them is of great significance for the further exploration evaluation and research work of shale gas in Silurian Longmaxi formation in southern China.
【作者單位】： 中國地質大學(北京)能源學院;中國石油化工股份有限公司頁巖油氣富集機理與有效開發(fā)國家重點實驗室;中國石油化工股份有限公司中國石化頁巖油氣重點實驗室;中國石油化工股份有限公司石油勘探開發(fā)研究院;中國石油大學(北京)地球科學學院;
【基金】：國家自然科學基金項目(41202103) 中國石油化工股份有限公司科技攻關項目(G5800-14-ZS-KJB158;G5800-13-ZSKJB005)
【分類號】：P618.13

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