本文選題：厚砂體 + 多物源區(qū)�。� 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：大情字井地區(qū)是松遼盆地南部有利的含油區(qū)帶,經(jīng)歷了多年的勘探開發(fā),認(rèn)識(shí)不斷深入,隨著技術(shù)方法的成熟多樣和井網(wǎng)系統(tǒng)的不斷加密,原有對(duì)物源體系、沉積相、油氣富集規(guī)律的認(rèn)識(shí)與一些新發(fā)現(xiàn)不斷出現(xiàn)矛盾,制約著本區(qū)進(jìn)一步的油氣勘探開發(fā),青三段Ⅻ砂組在本區(qū)儲(chǔ)層條件最好,多口探井試油試采效果良好。為此,對(duì)物源、沉積體系、成藏模式的清楚認(rèn)知是油田增儲(chǔ)、增產(chǎn)所需要亟待解決的問題。本文在對(duì)全區(qū)研究的基礎(chǔ)上,重點(diǎn)剖析了厚砂體的成因和油氣富集規(guī)律。以沉積學(xué)、地層學(xué)為指導(dǎo),利用巖心、鉆井、測(cè)井、三維地震解釋成果等多方面地質(zhì)資料,綜合測(cè)井曲線的韻律性及薄夾層分析、巖心觀察等5方面對(duì)Ⅻ砂組厚砂體進(jìn)行垂向可分性分析,結(jié)果表明厚砂體在垂向上可分,并根據(jù)公認(rèn)的標(biāo)準(zhǔn)井乾深8井、乾107井的分層標(biāo)準(zhǔn),對(duì)全區(qū)進(jìn)行了達(dá)小層級(jí)別的地層劃分與對(duì)比,建立了大情字井地區(qū)青三段Ⅻ砂組的層序地層格架。以區(qū)域沉積學(xué)方法為指導(dǎo),結(jié)合重礦物、泥巖顏色等6方面資料系統(tǒng)分析,認(rèn)為大情字井地區(qū)青三段Ⅻ砂組三源交匯,即西部通榆物源的西北分支、西南�？滴镌春湍喜繎训挛镌吹臇|南分支。西部通榆物源古坡度最大,是主物源,南部懷德物源為次物源、西南�？滴镌磳�(duì)研究區(qū)的影響最弱。通過巖心觀察,本區(qū)主要存在三角洲相和重力流相2種主要的相類型,特別是對(duì)厚砂體巖心的觀察,認(rèn)為厚砂體具有不同的成因特征,而其各種成因特征主要受控于物源體系的差異,主要分為:河口壩-河道退積疊置型、河口壩密集疊置、河道—河口壩密集疊置型、河道—河口壩分期疊置型等。以現(xiàn)代三角洲沉積學(xué)理論為指導(dǎo),在地層等時(shí)格架控制下分析了物源、沉積相的展布特征,建立三角洲前緣的測(cè)井相模式,識(shí)別水下分流河道、河口壩、席狀砂等沉積微相,厘定了研究區(qū)的相帶展布,砂巖空間分布的總體特征受控于研究區(qū)沉積相帶的展布,厚砂體主要分布于通榆物源控制地區(qū)和大部懷德物源控制區(qū)域以及�？滴镌唇刺�。在以上工作的基礎(chǔ)上,基于油氣成藏理論,在了解區(qū)域油水分布總體特征的基礎(chǔ)上,對(duì)Ⅻ砂組進(jìn)行密井網(wǎng)開發(fā)區(qū)和重點(diǎn)探評(píng)井區(qū)解剖,認(rèn)為研究區(qū)主要發(fā)育斷層—巖性油氣藏、巖性上傾尖滅油氣藏和背斜油氣藏三種油氣藏類型,其中斷層—巖性油氣藏占絕大多數(shù),溝通烴源巖和厚砂體的油源斷層即油源供給,是油氣藏形成的先決條件,成藏關(guān)鍵期正向古構(gòu)造的軸線為油氣優(yōu)勢(shì)運(yùn)移路徑,其上、附近圈閉最有利成藏,有效儲(chǔ)層特別是儲(chǔ)層性質(zhì)良好的厚砂體是形成油氣藏的基礎(chǔ),厚砂體對(duì)于油氣分布具有明顯的控制作用,中等厚度(2~6m)、條帶狀、有利相帶(河道、河口壩)的砂巖有利于油氣成藏。
[Abstract]:The Dazhengzhijing area is a favorable oil-bearing zone in the south of Songliao Basin. After many years of exploration and development, the understanding is deepening. With the maturation of technical methods and the continuous infilling of well pattern system, the original provenance system and sedimentary facies, The understanding of oil and gas enrichment law is in contradiction with some new discoveries, which restricts the further exploration and development of oil and gas in this area. The reservoir condition is the best in the third member of Qingshan formation, and the oil testing and production testing effect of multiple exploration wells is good. Therefore, a clear understanding of the provenance, sedimentary system and model of reservoir formation is an urgent problem to be solved for increasing reservoir and increasing production in oil fields. Based on the study of the whole area, the origin of thick sand body and the law of oil and gas enrichment are analyzed in this paper. Under the guidance of sedimentology and stratigraphy, the rhythm of logging curve and the analysis of thin intercalation are synthesized by using the geological data of core, drilling, logging, 3D seismic interpretation and so on. The vertical separability analysis of thick sand body of sand group XII from five aspects, such as core observation, shows that thick sand body can be separated vertically, and according to the accepted standard for stratification of Qianshen 8 well and Qian107 well, The stratigraphic classification and correlation of the sub-strata in the whole area have been carried out, and the sequence stratigraphic framework of the third member of the Qinghai sand formation in Dazhengzhijing area has been established. Guided by the method of regional sedimentology and the systematic analysis of six aspects of heavy minerals and mudstone color, it is considered that the three sources of the Qinghai sand formation in the third member of the Qing Dynasty in Dazhengzhijing area are the northwestern branch of the Tongyu material source in the western part of the region. The southeastern branch of the southwest Baokang source and the southern Wyde source. The ancient slope of Tongyu was the largest, which was the main source, the southern Huaide was the secondary source, and the southwest Baokang had the weakest influence on the study area. Through core observation, there are two main facies types in this area, delta facies and gravity flow facies, especially the observation of thick sand body core. It is considered that thick sand body has different genetic characteristics. The genetic characteristics are mainly controlled by the differences of provenance systems, which are mainly divided into three types: estuarine dam-channel degradation superposition type, estuary dam dense superposition type, river-estuarine dam superposition type and so on. Based on the theory of modern delta sedimentology, the distribution characteristics of provenance and sedimentary facies are analyzed under the control of stratigraphic isochronous frame, and the logging facies pattern of delta front is established, and the sedimentary microfacies such as underwater distributary channel, estuarine dam and sheet sand are identified. The distribution of facies belt in the study area is determined. The overall characteristics of sandstone spatial distribution are controlled by the distribution of sedimentary facies belt in the study area, and the thick sand body is mainly distributed in Tongyu source control area, most of Huaide material source control area and Baokang source near source area. On the basis of the above work, based on the oil and gas accumulation theory, and on the basis of understanding the general characteristics of the regional oil and water distribution, the authors have dissected the dense well pattern development zone and the key exploration and evaluation well area of the XII sand formation. It is considered that the main fault lithologic reservoirs are developed in the study area. There are three types of oil and gas reservoirs in lithologic updip pinnacle and anticline, in which fault lithologic reservoirs account for the majority. The oil source fault that connects the source rock and thick sand body is the prerequisite for the formation of oil and gas reservoir. The axis of forward paleotectonics in key period of reservoir formation is the dominant migration path of oil and gas. On the top of it, the trap near the reservoir is the most favorable for reservoir formation, and the effective reservoir, especially the thick sand body with good reservoir properties, is the basis of forming oil and gas reservoir. Thick sand bodies play an important role in controlling the distribution of oil and gas. The sandstone with medium thickness of 2 ~ 2 ~ 6 m ~ (-1), zonal shape and favorable facies (channel, estuary dam) is favorable for oil and gas accumulation.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13
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本文編號(hào)：1999583