本文關(guān)鍵詞：松遼盆地伏龍泉斷陷營城組構(gòu)造—層序地層特征　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 構(gòu)造-層序地層 沉積體系 構(gòu)造古地貌 層序結(jié)構(gòu)樣式 伏龍泉斷陷

【摘要】：伏龍泉斷陷位于松遼盆地東南部,為一“東斷西超”的半地塹,邊界斷層活動性的階段性強(qiáng)弱變化控制著盆地的形成、發(fā)展與演化。目前,已在營城組發(fā)現(xiàn)良好的油氣顯示,預(yù)示著較好的油氣勘探前景。因而本文以伏龍泉斷陷營城組為研究對象,主要應(yīng)用構(gòu)造地質(zhì)學(xué)、層序地層學(xué)與沉積學(xué)的基本理論與方法,綜合地震、鉆/測井、巖心以及測試分析等資料,開展構(gòu)造-層序地層學(xué)研究。通過分析伏龍泉斷陷營城組構(gòu)造活動、盆地結(jié)構(gòu)與古地貌特征,在層序界面識別基礎(chǔ)上建立整個盆地的層序地層格架,明確層序格架內(nèi)沉積相與沉積體系發(fā)育、演化特征,進(jìn)而總結(jié)伏龍泉斷陷營城組層序地層結(jié)構(gòu)樣式,探討構(gòu)造-層序-沉積之間的響應(yīng)關(guān)系。為伏龍泉斷陷油氣勘探提供地質(zhì)基礎(chǔ),也為類似的斷陷盆地構(gòu)造沉積學(xué)研究提供實例借鑒。伏龍泉斷陷的3條主要邊界斷層控制了伏北、伏南與顧家店等3個次洼的形成、發(fā)展與沉積充填過程。營城組沉積期邊界斷層的活動性總體表現(xiàn)為“北強(qiáng)南弱,早期活動性較強(qiáng)、晚期逐漸減弱”的特點,其沉積早期構(gòu)造古地貌呈現(xiàn)為“東西分帶,北深南淺”的格局,并進(jìn)一步劃分出7種不同地貌單元。根據(jù)地震與鉆井的層序界面識別,在伏龍泉斷陷營城組識別出2個三級層序(SQ1與SQ2),每個層序進(jìn)一步劃分為低位體系域、湖侵體系域與高位體系域。綜合巖心觀察、薄片鑒定、鉆/測井以及地震資料分析,伏龍泉斷陷營城組發(fā)育扇三角洲、辮狀河三角洲、水下扇以及湖泊等4種主要沉積相類型。從營城組早期至晚期,地層展布范圍逐漸擴(kuò)大,地貌差異減小,沉積物粒度總體變細(xì),沉積、沉降中心由南向北遷移,沉積體系由早期的扇三角洲、水下扇-湖泊沉積轉(zhuǎn)化為晚期的扇三角洲、辮狀河三角洲-湖泊沉積。盆地構(gòu)造樣式在研究區(qū)南北不同區(qū)域存在明顯差異,根據(jù)3種不同盆地結(jié)構(gòu)形態(tài)、層序內(nèi)部結(jié)構(gòu)及沉積充填展布特征,伏龍泉斷陷營城組發(fā)育3種典型層序結(jié)構(gòu)樣式:多級斷階型、平緩斜坡型與撓曲坡折型。綜合分析表明伏龍泉斷陷東側(cè)3條主要邊界斷層活動的時空差異性對于層序的界面形成、可容納空間變化以及層序內(nèi)部構(gòu)成特征也具有重要的控制作用。盆地發(fā)育的不同構(gòu)造古地貌單元對沉積體系類型及展布控制明顯,制約著砂體的分散與堆積。
[Abstract]:The Fulongquan fault depression is located in the southeast of Songliao Basin. It is a semi-graben with "east fault and west superimposed". The stage change of boundary fault activity controls the formation, development and evolution of the basin. A good oil and gas display has been found in Yingcheng formation, which indicates a good prospect of oil and gas exploration. Therefore, this paper takes Yingcheng formation in Fulongquan fault depression as the research object, and mainly applies structural geology. The basic theory and method of sequence stratigraphy and sedimentology, synthesizing the data of earthquake, drilling / logging, core and test analysis, are carried out to study the tectonic-sequence stratigraphy. The tectonic activity of Yingcheng formation in Fulongquan fault depression is analyzed. The basin structure and paleogeomorphology characteristics, on the basis of sequence interface identification, the whole basin sequence stratigraphic framework is established, and the sedimentary facies and sedimentary system development and evolution characteristics in the sequence framework are defined. The sequence stratigraphic pattern of Yingcheng formation in Fulongquan fault depression is summarized, and the response relationship between tectonics, sequence and sedimentation is discussed, which provides a geological basis for oil and gas exploration in Fulongquan fault depression. The three main boundary faults in the Fulong Quan fault depression controlled the formation of three sub-depression in Fubei, Founan and Gujiadian. The activity of boundary faults of Yingcheng formation during sedimentary period is characterized by "north strong south weak, early strong activity, late gradual weakening". The early sedimentary tectonic paleogeomorphology is characterized by a pattern of "east-west zonation, deep and southern shallowness in the north", and 7 different geomorphologic units are further divided, and identified according to the sequence interface between earthquakes and drilling wells. Two third-order sequences SQ1 and SQ2 were identified in Yingcheng formation of Fulongquan fault depression. Each sequence was further divided into low system tract, lacustrine transgressive system tract and high system tract. Based on drilling / logging and seismic data analysis, four main sedimentary facies types, namely fan delta, braided river delta, underwater fan and lake, were developed in Yingcheng formation, from the early to the late period of Yingcheng formation. The distribution of strata gradually expanded, the difference of geomorphology decreased, the grain size of sediment became finer, the sedimentation center moved from south to north, and the sedimentary system changed from the early fan delta. The subaqueous fan lacustrine deposits are transformed into late fan deltas, braided river deltas and lacustrine sediments. The structural styles of the basins are obviously different in different regions north and south of the study area, according to three different basin structure forms. The internal structure of sequence and the characteristics of sedimentary filling distribution, three typical sequence structural styles are developed in Yingcheng formation of Fulongquan fault depression: multistage fault terrace. The comprehensive analysis shows that the temporal and spatial differences of the three main boundary faults in the east side of the Fulongquan fault depression are related to the formation of the sequence interface. Different tectonic paleogeomorphic units developed in the basin control the type and distribution of sedimentary system obviously, which restrict the dispersion and accumulation of sand body.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13;P539.2

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