發(fā)布時(shí)間：2018-04-14 11:20

  本文選題：四川盆地 + 洗象池群　； 參考：《地質(zhì)科技情報(bào)》2017年02期

【摘要】：四川盆地寒武系洗象池群發(fā)育大套白云巖,由于巖性、電性差異小,化石稀少,地層厚度變化大,層序劃分與演化特征一直存在很大爭(zhēng)議。基于層序地層學(xué)及沉積學(xué)相關(guān)理論研究,通過(guò)對(duì)露頭剖面、鉆井巖心的觀察及測(cè)井資料的研究,結(jié)合測(cè)井曲線頻譜趨勢(shì)分析技術(shù)及碳氧同位素相關(guān)數(shù)據(jù),開(kāi)展對(duì)洗象池群層序地層的劃分及建立全盆地統(tǒng)一的層序地層格架研究。盆地內(nèi)雖然基本都是一套白云巖,各分區(qū)命名差異大,但依然具有全盆范圍內(nèi)可對(duì)比的不整合界面和最大海泛面。研究認(rèn)為四川盆地洗象池群可劃分為4個(gè)三級(jí)層序,并且厘定了盆地內(nèi)各分區(qū)間的層序地層對(duì)應(yīng)關(guān)系。在建立全盆地層序地層格架的基礎(chǔ)上,發(fā)現(xiàn)洗象池群地層分布呈西薄東厚的楔形體,其中遂寧-樂(lè)至-資陽(yáng)以西缺乏洗象池群沉積。層序格架內(nèi)有利儲(chǔ)集層的分布明顯受控于層序界面,其中顆粒灘相主要發(fā)育在高位體系域。
[Abstract]:The Cambrian Xixiang pool group in Sichuan basin developed a large set of dolomite. Because of its lithology, small difference in electrical properties, rare fossils and great changes in stratigraphic thickness, the division of sequence and the characteristics of evolution have always been controversial.Based on the theoretical study of sequence stratigraphy and sedimentology, through the observation of outcrop profile, drilling core and logging data, combined with logging curve spectrum trend analysis technology and carbon-oxygen isotope related data.The division of sequence stratigraphy and the establishment of a unified sequence stratigraphic framework of the whole basin are carried out.Although the basin is basically a set of dolomite with great differences in the naming of each zone, it still has a comparable unconformable interface and the largest sea panoramic surface in the whole basin.It is considered that the Xixiang pool group in Sichuan Basin can be divided into four third-order sequences, and the sequence stratigraphic correspondence of each interval in the basin is determined.Based on the establishment of sequence stratigraphic framework in the whole basin, it is found that the strata of the Xianghuangchi Group are in the form of a west thin and thick wedge body, in which the west of Suining, Lezhi and Ziyang lacks the deposit of the wash elephant pool group.The distribution of favorable reservoirs in the sequence framework is obviously controlled by the sequence interface, in which the grain-beach facies mainly develop in the high system tract.
【作者單位】： 中國(guó)石油勘探開(kāi)發(fā)研究院;中國(guó)石油西南油氣田公司;
【基金】：國(guó)家重大專(zhuān)項(xiàng)(2011ZX05004-002)
【分類(lèi)號(hào)】：P618.13;P534.41

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