本文選題：赤水地區(qū) + 斷層相關(guān)褶皺��； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：在前人研究基礎(chǔ)上,利用地震剖面結(jié)合鉆井資料以及平衡剖面方法定性定量分析川東南赤水地區(qū)構(gòu)造及演化特征,同時(shí)采用構(gòu)造砂箱模擬手段對(duì)研究區(qū)滑脫層形成上下兩套不匹配構(gòu)造變形的控制因素及變形過(guò)程進(jìn)行實(shí)驗(yàn)研究,對(duì)比分析構(gòu)造對(duì)下伏深層-超深層油氣藏的保存作用,從而為川東南地區(qū)深層油氣成藏研究提供理論依據(jù)。研究區(qū)整體構(gòu)造呈現(xiàn)由盆外到盆內(nèi)變形強(qiáng)度逐漸減弱的趨勢(shì),受SE-NW和SW-NE兩個(gè)方向應(yīng)力場(chǎng)同時(shí)疊加作用,造成了現(xiàn)今兩組構(gòu)造形跡的分布,其構(gòu)造變形及演化主要受中上寒武統(tǒng)膏鹽巖滑脫層控制,形成滑脫層上、下不同的構(gòu)造變形樣式:滑脫層之上構(gòu)造變形晚且變形強(qiáng),背、向斜連續(xù)相間分布,褶皺幾何形態(tài)受控于核部或兩翼發(fā)育的大型逆斷層,滑脫層于背斜核部加厚并向兩翼逐漸減薄,斷層向下終止于滑脫層內(nèi);滑脫層之下地層構(gòu)造穩(wěn)定,變形強(qiáng)度較弱,僅局部有小的隆起�；搶又系貙游灰瓶s短量是滑脫層之下的6.4-10倍,形成斷滑與斷展的復(fù)合構(gòu)造,其變形程度和變形特征不僅受滑脫層控制還與變形快慢有關(guān)。以川東南地層條件為約束所進(jìn)行的砂箱模擬實(shí)驗(yàn)驗(yàn)證了上述結(jié)論。因此,研究區(qū)中上寒武統(tǒng)滑脫層作為時(shí)代最老、厚度最大的一套滑脫層直接影響了川東南赤水地區(qū)多條斷層的形成演化、褶皺形態(tài)的變化和西門(mén)構(gòu)造區(qū)雙層構(gòu)造樣式的形成。在此研究基礎(chǔ)上根據(jù)區(qū)域擠壓的強(qiáng)弱程度和滑脫層的分布,可以將川東南地區(qū)構(gòu)造對(duì)油氣保存條件的差異劃分為三個(gè)帶:(1)造山帶-盆地邊緣強(qiáng)變形帶;(2)盆地邊緣-川東南北東部中強(qiáng)變形帶;(3)盆地邊緣-盆內(nèi)赤水地區(qū)弱變形帶。川東南地區(qū)早期構(gòu)造保存條件較好,推測(cè)其油氣成藏經(jīng)歷了以下幾個(gè)階段:二疊紀(jì)-三疊紀(jì)形成燈影組古油藏→三疊紀(jì)-侏羅紀(jì)油裂解形成古氣藏→晚白堊世古氣藏調(diào)整和破壞階段。在強(qiáng)至中強(qiáng)變形帶保存條件變差,油氣直接通過(guò)斷層或側(cè)向運(yùn)移逸散。但盆地內(nèi)弱變形帶,滑脫層之下圈閉條件持續(xù)存在,側(cè)向及垂向保藏條件均比其余地區(qū)好,具有良好的勘探前景。
[Abstract]:On the basis of previous studies, the structural and evolutionary characteristics of Chishui area in southeastern Sichuan are analyzed qualitatively and quantitatively by seismic profile combined with drilling data and balanced profile method. At the same time, by means of structural sand box simulation, the controlling factors and deformation process of the upper and lower sets of unmatched structural deformation of the slip layer in the study area are studied experimentally, and the effects of the structure on the preservation of the down-deep and ultra-deep reservoirs are compared and analyzed. It provides theoretical basis for the study of deep oil and gas accumulation in southeast Sichuan. The whole structure of the study area shows the tendency of weakening the deformation intensity from the outside basin to the inside basin, and the stress field of SE-NW and SW-NE superposes at the same time, which results in the distribution of the two groups of tectonic patterns. The tectonic deformation and evolution are mainly controlled by the middle and upper Cambrian gypsum rock detachment, forming different structural deformation patterns above and below the slippage layer: late and strong tectonic deformation above the slippage layer, the back and syncline continuous phase distribution, the tectonic deformation and evolution are mainly controlled by the middle and upper Cambrian gypsum rock slippage layer. The geometry of the fold is controlled by the large thrust fault developed in the nucleus or wings, the slip layer is thickened in the nucleus of the anticline and gradually thinned down to the two wings, and the fault terminates in the delamination layer, the strata beneath the slip layer are stable in structure and the deformation intensity is relatively weak. There are only small bulges. The displacement shortening of the stratum above the slip layer is 6.4-10 times of that under the slip layer, which forms a composite structure of fault-slip and fault-spreading. Its deformation degree and deformation characteristics are not only controlled by the slip layer, but also related to the deformation speed and speed. The above conclusions are verified by sand box simulation experiments with the formation conditions in southeast Sichuan. Therefore, the Middle and Upper Cambrian detachment is the oldest and thickest set of slip beds in the study area, which directly affects the formation and evolution of many faults, the changes of fold morphology and the formation of double-layer structural style in Ximen tectonic area. On the basis of this study, according to the degree of regional compression and the distribution of slip layer, The difference of oil and gas preservation conditions in southeast Sichuan can be divided into three zones: 1) orogenic belt-strong deformed zone of basin margin) basin margin-middle and strong deformation zone of east and south of Sichuan province-3) margin of basin and weak deformation zone of Chishui area in basin. The early tectonic preservation conditions in southeastern Sichuan are good. It is inferred that the formation of oil and gas reservoirs has gone through the following stages: the period of Permian-Triassic formation of Dengying formation and the stage of adjustment and destruction of Paleocene gas reservoirs during the late Cretaceous of Paleo-gas reservoir formed by oil cracking of Triassic to Jurassic. In the strong to moderate deformation zones, the preservation conditions become poor, and the oil and gas migrate and dissipate directly through faults or sideways. However, the weak deformation zone in the basin, the trap conditions under the slip layer are persistent, the lateral and vertical preservation conditions are better than those in the other areas, and the exploration prospect is good.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P618.13

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