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哈薩克斯坦Marsel探區(qū)下石炭統(tǒng)高頻層序地層特征與沉積演化

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  本文選題:哈薩克斯坦 + Marsel探區(qū)。 參考:《古地理學(xué)報(bào)》2017年05期


【摘要】:根據(jù)Gr值、TH/U值和成像測(cè)井等測(cè)井資料,以及巖心、薄片等反映沉積基準(zhǔn)面和沉積相變化的資料,在哈薩克斯坦Marsel探區(qū)下石炭統(tǒng)碳酸鹽巖臺(tái)地內(nèi)劃分出18個(gè)高頻層序(四級(jí)層序),其中杜內(nèi)階和維憲階高頻層序界面類型主要為瞬時(shí)加深淹沒(méi)間斷面,謝爾普霍夫階高頻層序界面類型主要為瞬時(shí)暴露間斷面。高頻層序一般厚十幾米至幾十米,杜內(nèi)期—維憲早期厚度較薄且差異不大,維憲中晚期—謝爾普霍夫期厚度差異增大,最終使下石炭統(tǒng)整體呈西薄東厚、北薄南厚的特征。杜內(nèi)—維憲早期高頻層序下部主要發(fā)育蒸發(fā)o_湖和局限o_湖亞相,上部主要為局限潮坪亞相;維憲中晚期—謝爾普霍夫期高頻層序下部主要發(fā)育局限潮坪亞相,向上變?yōu)檎舭l(fā)潮坪和臺(tái)內(nèi)淺灘亞相。通過(guò)對(duì)高頻層序的成因分析認(rèn)為,周期性高頻海平面升降變化和氣候是高頻層序發(fā)育的主控因素,氣候?qū)S憲晚期—謝爾普霍夫期高頻層序發(fā)育的影響更大。Marsel探區(qū)在早石炭世位于鑲邊臺(tái)地內(nèi)部,先后經(jīng)歷了早期(杜內(nèi)期)局限臺(tái)地—蒸發(fā)臺(tái)地、中期(維憲期)局限臺(tái)地—蒸發(fā)臺(tái)地和晚期(謝爾普霍夫期)開闊臺(tái)地—局限臺(tái)地—蒸發(fā)臺(tái)地這3期沉積演化過(guò)程。高頻層序的研究為建立高精度層序地層格架和有利儲(chǔ)集層的精細(xì)劃分、對(duì)比及預(yù)測(cè)奠定了基礎(chǔ)。
[Abstract]:According to the values of Gr, TH- / U, imaging logging and other logging data, as well as the core, thin slice and other data reflecting the change of sedimentary datum and sedimentary facies, In the lower Carboniferous carbonate platform of Marsel exploration area, Kazakhstan, 18 high-frequency sequences (Quadrature sequence) have been divided, in which the interfacial types of high-frequency sequences of Dune and Weixian are mainly instantaneous deepening submerged discontinuities. The main types of high frequency sequence interface in the Scherphoff order are transient exposure intersections. The high frequency sequence is usually more than 10 meters to several tens meters thick, and the thickness of the Dune period to the early stage of Weixian is thin and the difference is small, and the thickness difference of the middle and late period of the Weixian to the Sherphoff period increases, which finally makes the lower Carboniferous series as a whole with a thickness of west thin east and north south thick. The lower part of the high frequency sequence mainly developed evaporative olake and limited olake subfacies, the upper part was mainly confined tidal flat subfacies, and the lower part of the high frequency sequence mainly developed limited tidal flat subfacies in the middle and late period of Weixian to Scherphoff period, and the lower part of the high frequency sequence in the middle and late period of Weixian developed limited tidal flat subfacies. Up to the evaporative tidal flat and subfacies of the shoal in the platform. By analyzing the cause of formation of high frequency sequence, it is concluded that periodic high frequency sea level fluctuation and climate are the main controlling factors for the development of high frequency sequence. The influence of climate on the development of high-frequency sequences in the late Weixian and Schaphov period is greater. The Marsel exploration area is located in the edge terrace in the early Carboniferous, and has experienced the early stage (Dune period) limited platform and evaporation platform, and the Marsel exploration area is located in the early Carboniferous. The sedimentary evolution processes of the three periods are limited platform-evaporation platform and late stage (Shephov period) open platform-limited platform-evaporation platform. The study of high-frequency sequences lays a foundation for the establishment of high-precision sequence stratigraphic framework and the fine division, correlation and prediction of favorable reservoirs.
【作者單位】: 中國(guó)地質(zhì)大學(xué)(北京)能源學(xué)院;中國(guó)地質(zhì)大學(xué)(北京)海洋學(xué)院;洲際油氣股份有限公司;
【基金】:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(編號(hào):2011CB201100-03) 中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(編號(hào):2652015362)聯(lián)合資助~~
【分類號(hào)】:P618.13

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