本文關(guān)鍵詞： 四川盆地 龍王廟組 混合沉積 物源 油氣影響　出處：《成都理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：四川盆地是我國西南部重要的含油氣盆地,天然氣資源非常豐富,寒武系龍王廟組作為重要的儲(chǔ)集層位,前人研究較少,近期研究成果表明,龍王廟組發(fā)育陸源碎屑與碳酸鹽的混合沉積。陸源碎屑與碳酸鹽的混合沉積因其特殊的機(jī)理及重要的理論和實(shí)際意義,為學(xué)者們廣為關(guān)注。然而,針對四川盆地的混合沉積研究較少,對盆地深層的研究更少。本文結(jié)合區(qū)域地質(zhì)資料、鉆井資料、野外剖面資料等,對川中地區(qū)下寒武統(tǒng)龍王廟組混合沉積特征、物源、沉積模式及其對油氣地質(zhì)條件的影響等進(jìn)行探討。川中地區(qū)龍王廟組沉積期,盆地呈西淺東深的構(gòu)造格局,沉積環(huán)境屬于海相臺地沉積,形成以碳酸鹽組分為主的混合沉積。通過該區(qū)多口鉆井資料顯示,混積巖主要為含粉砂殘余砂屑白云巖、含粉砂殘余鮞粒白云巖、含粉砂粉晶白云巖,少見粉砂質(zhì)白云巖,混積層系為碳酸鹽巖-混積巖層系與混積巖層系。混合沉積中的陸源碎屑成分為陸源石英,粒級為粉砂級,分選好、磨圓差,主要以5種形式賦存于碳酸鹽巖中�；旌铣练e類型為漸變式混合沉積及復(fù)合式混合沉積Ⅱ兩種類型;陸源石英含量縱向上受海平面變化控制,混合沉積伴隨海侵-海退旋回發(fā)育,海侵期混合沉積發(fā)育強(qiáng)度及厚度明顯高于海退期;在三種沉積微相中,混合沉積發(fā)育強(qiáng)度由大到小依次為灘間洼地微相、混積顆粒灘微相、顆粒灘微相。平面上受古地貌控制,高石梯地區(qū)混合沉積發(fā)育強(qiáng)度及厚度均大于磨溪地區(qū)。通過對川中及川北地區(qū)龍王廟組混合沉積特征的研究發(fā)現(xiàn):①川北地區(qū)龍王廟組混合沉積的陸源石英顆粒粒徑及含量大于川中地區(qū);②川北地區(qū)龍王廟組混合沉積強(qiáng)度大于川中地區(qū);③川北地區(qū)龍王廟組混合沉積樣式多于川中地區(qū),說明川中地區(qū)龍王廟期環(huán)境變化緩慢,與純碳酸鹽沉積環(huán)境無差異,而川北地區(qū)則有環(huán)境突變的現(xiàn)象。川中地區(qū)龍王廟組發(fā)育三期風(fēng)暴沉積作用,發(fā)育典型的風(fēng)暴沉積構(gòu)造,如沖刷-充填構(gòu)造、風(fēng)暴礫屑層、風(fēng)暴層理構(gòu)造等,對川中地區(qū)龍王廟組風(fēng)暴礫屑厚度統(tǒng)計(jì)后發(fā)現(xiàn),風(fēng)暴巖的展布方向?yàn)楸睎|-南西向,說明川中地區(qū)龍王廟期古海水的流動(dòng)方向?yàn)楸睎|-南西向。結(jié)合川北與川中龍王廟組混合沉積特征、川中地區(qū)龍王廟組風(fēng)暴沉積特點(diǎn)、古海水流動(dòng)方向及風(fēng)暴的運(yùn)動(dòng)特點(diǎn)的研究,推測混合沉積物源來自川北地區(qū)�；诖�,筆者認(rèn)為川中地區(qū)龍王廟期沉積環(huán)境為臺內(nèi)潮坪沉積,主要以潮間-潮下為主,并建立混積潮坪沉積模式,認(rèn)為構(gòu)造運(yùn)動(dòng)、海平面變化、古地貌、物源、風(fēng)暴作用、氣候因素對混合沉積具有明顯的控制作用,幾種因素互相影響,共同作用,形成了川中地區(qū)龍王廟組混合沉積特征。綜合該區(qū)及前人研究,認(rèn)為混合沉積必須發(fā)育裂縫才能形成良好儲(chǔ)層,川中地區(qū)龍王廟組沉積早期受混合沉積影響,顆粒灘沉積不發(fā)育,中后期混合沉積影響減弱,沉積環(huán)境過渡為“清水”環(huán)境,顆粒灘沉積厚層發(fā)育,為儲(chǔ)層的形成提供良好的物質(zhì)基礎(chǔ)。推測川東北通南巴地區(qū)龍王廟組儲(chǔ)層質(zhì)量不佳。
[Abstract]:Sichuan basin is an important oil-bearing basin in southwestern China, natural gas resources are very rich, the Cambrian Longwangmiao formation in strata as an important reservoir, fewer previous studies, recent research results show that the Dragon King Temple group developed mixed sedimentation of terrigenous clastic and carbonate sedimentary debris and Lu Yuansui. Mixed carbonate because of its special mechanism and an important theoretical and practical significance, for scholars wide attention. However, the less mixed sedimentation of Sichuan basin, the deep basin research. In this paper, combined with regional geological data, drilling data, outcrop, the Sichuan region of Lower Cambrian Longwangmiao formation mixed sedimentary characteristics and provenance. Study on sedimentary model and petroleum geological conditions and so on. During the deposition of Longwangmiao formation in Sichuan Basin, tectonic pattern is shallow in the west east, the sedimentary environment belongs to Taiwan sea deposited to form The carbonate component mixed sediments. Through this area drilling wells data show that hunji rock is mainly silt residual dolarenite, silty residual oolitic dolomite and silty dolomite, rare silty dolomite, hunji sequence for carbonate rock strata and hunji mixed sedimentary strata. Terrigenous clastic composition in mixed sediments are terrigenous quartz particles for silt, good sorting, grinding, mainly in 5 forms in carbonate rocks. Mixed sedimentary type is a gradual mixed sedimentary and composite mixed deposits of two types of terrigenous quartz content vertically; controlled by sea-level change, mixed with sedimentary transgression regression cycles of development, transgression of mixed depositional intensity and thickness was significantly higher than that in the regression period; three kinds of sedimentary micro facies, intensity from high to low is flat depressions between microfacies mixed sedimentary development, hunji shoal Micro facies, grain beach microfacies. The plane by palaeogeomorphology, Gaoshiti area strength and thickness of the mixed sedimentary development than Moxi area. By studying the Sichuan and Sichuan Longwangmiao formation mixed sedimentary characteristics that mixed sedimentary Longwangmiao formation in northern Sichuan the Lu Yuanshi particle size and content more than Sichuan area; the Sichuan Longwangmiao formation mixed sedimentary strength is greater than the Sichuan area; the Sichuan Longwangmiao formation in Sichuan style more than the mixed sediments, indicating the Dragon King Temple in Sichuan environment changes slowly, with no difference between the pure carbonate sedimentary environment, and has the mutation of Sichuan Sichuan. In Longwangmiao formation developed three stages of storm deposition, the development of storm sedimentary structures typical, such as scouring filling structures, storm gravel layer, storm bedding structure, statistics of Sichuan Longwangmiao formation storm gravel thickness After that, the direction of storm rock is NE-SW, which indicates that the flow direction of ancient seawater Longwangmiao period in Sichuan is NE-SW. Combined with Sichuan and Sichuan in Longwangmiao formation mixed sedimentary features of Sichuan Longwangmiao formation characteristics of storm deposits, study the movement characteristics of ancient water flow direction and the storm, that mixed sediment source from Sichuan. Based on this, the author thinks that the sedimentary environment of Longwangmiao period in Sichuan Taiwan in the tidal flat deposits mainly in the intertidal - subtidal mainly, and the establishment of mixed tidal flat sedimentary model, it is considered that the tectonic movement, sea level change, ancient landform, provenance the storm, effect of climate factors has obvious control effect on mixed sediments, several factors influence each other, together, formed in Sichuan Longwangmiao formation mixed sedimentary characteristics. A comprehensive study of the region and the previous, think mixed deposits must develop cracks to form A good reservoir, Sichuan Longwangmiao formation sedimentary early mixed sediments, sedimentary particles are not developed, weakened in the late mixed deposition effect, the sedimentary environment of transition to "clean" environment, shoal deposition of thick layer development, provide good material foundation for the formation of the reservoir. That northeast Sichuan through the Dragon King Temple of the reservoir Nanba area of poor quality.

【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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