【摘要】：塔河油田位于新疆塔里木盆地東北部。目前,對于塔河油田的碎屑巖油氣勘探開發(fā)已經(jīng)進(jìn)入中后期階段,勘探目標(biāo)從大型的構(gòu)造圈閉逐漸轉(zhuǎn)向小規(guī)模的巖性圈閉。隨著近些年來對T903井區(qū)巖性油氣藏勘探的突破,引起了西北局對塔河油田九區(qū)白堊系舒善河組的重視。白堊系舒善河組的巖性圈閉勘探程度還比較低,目前所掌握的資料比較少,有很多問題都阻礙著舒善河組油氣勘探。論文研究的主要層系為白堊系舒善河組。通過對測井曲線、地震資料的分析,在高分辨率層序地層學(xué)理論指導(dǎo)下,進(jìn)行長期、中期、短期旋回基準(zhǔn)面的識別,將白堊系舒善河組劃分為1個長期旋回(KLSC1)、3個中期旋回(KMSC1~KMSC3)以及若干個短期旋回,并在此基礎(chǔ)上建立了等時地層格架。在等時地層格架約束下,進(jìn)行砂體和沉積相的橫縱向展布特征研究。舒善河組KMSC1旋回主要為辮狀河三角洲前緣亞相,微相為水下分流河道及分流間灣,主要發(fā)育水下分流河道砂體,砂體連續(xù)性好,測井解釋含油氣層主要集中在該旋回上部小層(2號砂層組和3號砂層組);舒善河組KMSC2旋回主要為濱淺湖亞相,微相為淺湖泥及砂壩,主要發(fā)育砂壩砂體,在平面上呈塊狀分布,橫向上砂體不連續(xù)。但測井解釋油氣顯示良好,主要集中在旋回的下部小層(4號砂層組和5號砂層組)。舒善河組KMSC3旋回主要為辮狀河三角洲前緣亞相,微相為為水下分流河道及分流間灣,砂體發(fā)育且連續(xù)性較好,但沒有油氣顯示。通過對提取的多種地震屬性進(jìn)行反復(fù)的對比分析,發(fā)現(xiàn)平均絕對振幅屬性能很好的反映出砂泥的分布情況。在此基礎(chǔ)上,對井點處的屬性值以及與之對應(yīng)目的層段的實鉆砂體厚度進(jìn)行統(tǒng)計,進(jìn)行相關(guān)性分析,可以得到一定的相關(guān)性,能夠大致弄清砂體的展布情況。研究區(qū)內(nèi)常規(guī)的波阻抗反演剖面不能夠很好的區(qū)分砂巖和泥巖,運用擬聲波反演可以很好的識別8m以上的砂體。在九區(qū)白堊系舒善河組KMSC1~KMSC2旋回小層里共識別出11個圈閉,其中8個巖性圈閉,3個構(gòu)造-巖性圈閉。根據(jù)砂體的發(fā)育情況、蓋層封堵性、含油氣性、與油源的連通情況綜合考慮,優(yōu)選出1個有利圈閉。
[Abstract]:Tahe Oilfield is located in the northeast of Tarim Basin, Xinjiang. At present, the exploration and development of clastic rocks in Tahe Oilfield has entered the middle and late stage, and the exploration targets have gradually shifted from large structural traps to small scale lithologic traps. With the breakthrough of lithologic reservoir exploration in T903 well area in recent years, attention has been paid to the Cretaceous Shushanhe formation in Tahe Oilfield. The lithologic trap exploration degree of the Cretaceous Shushanhe formation is still relatively low, and the information available at present is relatively few, there are many problems which hinder the oil and gas exploration of the Shushanhe formation. The main layer studied in this paper is the Cretaceous Shushanhe formation. Based on the analysis of logging curves and seismic data and under the guidance of high resolution sequence stratigraphy theory, the long, medium and short term cycle datum levels are identified, and the Cretaceous Shushanhe formation is divided into a long term cycle (KLSC1). On the basis of three KMSC1~KMSC3 and several short term cycles, isochronous stratigraphic framework has been established. The transverse and longitudinal distribution characteristics of sand bodies and sedimentary facies are studied under the constraints of isochronous stratigraphic framework. The KMSC1 cycle of the Shushanhe formation is mainly braided delta front subfacies, the microfacies is the underwater distributary channel and the interdistributary bay, the sand body of the underwater distributary channel is mainly developed, and the sand body has good continuity. Log interpretation of oil-bearing gas reservoirs mainly concentrated in the upper sublayer of the cycle (No. 2 sand formation and No. 3 sand formation); The KMSC2 cycle of Shushanhe formation is mainly composed of shallow lacustrine subfacies, and the microfacies is shallow lake mud and sand dam. But the oil and gas interpretation of logging shows well, mainly in the lower sublayer of the cycle (4 sand formation and 5 sand formation). The KMSC3 cycle of Shushanhe formation is mainly braided river delta front subfacies, while the microfacies is underwater distributary channel and interdistributary bay, sand body is developed and continuity is good, but there is no oil and gas show. Through repeated comparison and analysis of various seismic attributes extracted, it is found that the average absolute amplitude attribute can well reflect the distribution of sand and mud. On this basis, the property values at the well point and the thickness of the solid sand body corresponding to the target layer are statistically analyzed, and the correlation can be obtained, and the distribution of the sand body can be roughly clarified. The conventional wave impedance inversion section in the study area can not distinguish sandstone and mudstone well. Using pseudo acoustic inversion can identify sand bodies over 8 m. A total of 11 traps were identified in the KMSC1~KMSC2 sublayer of the Cretaceous Shushanhe formation in the Jiulong area, including 8 lithologic traps and 3 tectonic-lithologic traps. According to the development of sand body, sealing property of caprock, oil and gas content and connection with oil source, a favorable trap is selected.
【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】：2017
【分類號】：P618.13

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