【摘要】：珠江口盆地L凹陷始新統(tǒng)文昌組處于勘探初期,鉆井資料較少且分布不均,基于多井多資料的常規(guī)沉積相研究方法受到限制,對(duì)于層序地層和沉積體系沒(méi)有系統(tǒng)研究,本次研究充分利用地震、測(cè)井以及巖心資料,在全區(qū)開(kāi)展地震相研究工作,井震結(jié)合對(duì)沉積相展布進(jìn)行研究,建立裂陷期文昌組沉積演化模式。結(jié)果表明:L凹陷裂陷期文昌組劃分為3個(gè)三級(jí)層序,8個(gè)體系域;根據(jù)三級(jí)層序體系域內(nèi)部地震反射外部形態(tài)和內(nèi)部反射特征差異,識(shí)別出充填、席狀、楔形、塊狀、丘形5種地震相類型;通過(guò)分析巖心相、測(cè)井相以及各種地震相特征,井震結(jié)合將地震相轉(zhuǎn)為沉積相,識(shí)別出辮狀河三角洲、扇三角洲、湖相等沉積相;初始裂陷期為小盆小湖模式,凹陷分割性較強(qiáng),主要為近源扇三角洲粗碎屑沉積,強(qiáng)烈裂陷早期為大盆淺湖模式,洼陷連通,主要為辮狀河三角洲沉積,強(qiáng)烈裂陷中晚期為大盆深湖模式,主要對(duì)應(yīng)半深湖泥巖沉積,弱裂陷期主要為大盆淺湖模式,主要對(duì)應(yīng)大規(guī)模長(zhǎng)軸辮狀河三角洲充填沉積體系。
[Abstract]:The Wenchang formation of Eocene in the L depression of Pearl River mouth basin is in the early stage of exploration, the drilling data are less and distributed unevenly, the conventional sedimentary facies research method based on multi-well and multi-data is limited, and there is no systematic study on sequence stratigraphy and sedimentary system. In this study, seismic facies research was carried out in the whole area by making full use of seismic, well logging and core data. The sedimentary evolution model of Wenchang formation in rift period was established by combining well earthquakes with sedimentary facies distribution. The results show that the Wenchang formation in the rift period of L depression is divided into three third-order sequences and eight system tracts. According to the internal seismic reflection external morphology and internal reflection characteristics of the third order sequence system tract, five types of seismic facies are identified: filling, sheet, wedge, block and mound. By analyzing the characteristics of core facies, logging facies and various seismic facies, the well and earthquake facies are transformed into sedimentary facies, and the braided river delta, fan delta and lake sedimentary facies are identified. The initial rift stage is a small basin and small lake model, and the sag has a strong divisibility, which is mainly composed of coarse clastic deposits in the near-source fan delta, a large basin and shallow lake model in the early stage of the strong rift, and connected sag, mainly braided river delta deposition. In the middle and late period of strong rifting, it is a deep lake model of large basin, which mainly corresponds to the mudstone deposit of semi-deep lake, while the weak rift stage is mainly a model of shallow lake in large basin, which corresponds to the filling system of large scale braided river delta of long axis.
【作者單位】： 中國(guó)石油大學(xué)(北京)地球科學(xué)學(xué)院;西安石油大學(xué);中海石油深圳分公司;中國(guó)石化華東分公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào):41672098)資助~~
【分類號(hào)】：P512.2;P618.13

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