【摘要】：葡萄溝-葡北地區(qū)位于吐哈盆地臺北凹陷西部,七克臺組一段與三間房組三段儲層較為發(fā)育,油氣資源豐富。受多期構(gòu)造運(yùn)動影響,斷裂極為發(fā)育,逆掩推覆構(gòu)造帶形成多個中小型斷背斜,局部地區(qū)發(fā)育低幅度構(gòu)造。當(dāng)前多數(shù)規(guī)模較大的背斜構(gòu)造均已上鉆,且多數(shù)井取得工業(yè)油流,而低幅度構(gòu)造的勘探程度較低,因此低幅度構(gòu)造區(qū)域極具勘探前景。隨著探區(qū)勘探程度的提高,葡萄溝-葡北地區(qū)的構(gòu)造特征認(rèn)識得以不斷深入。經(jīng)鉆探后發(fā)現(xiàn),低幅構(gòu)造高點(diǎn)位置與先前認(rèn)知存在-定的偏差,最初上鉆的探井位置大多未能落在高點(diǎn)上,并且還存在部分遺漏的低幅度構(gòu)造未能識別出來。因此,急需明確該地區(qū)相對合理的構(gòu)造特征,識別低幅度構(gòu)造。 本次研究以葡萄溝-葡北地區(qū)連片三維地震資料為基礎(chǔ),對第三系至侏羅系的主要目的層進(jìn)行精細(xì)解釋、斷裂發(fā)育特征研究,并針對油氣主要產(chǎn)層進(jìn)行儲層預(yù)測。在對第三系至侏羅系井下地層劃分與地震層位綜合標(biāo)定的基礎(chǔ)上,建立葡萄溝一葡北地區(qū)主要目的層地震地質(zhì)層序格架與地震地質(zhì)解釋方案,查明研究區(qū)主要構(gòu)造形態(tài)。為了更準(zhǔn)確識別低幅度構(gòu)造,采用正演模擬技術(shù)對小斷層與微起伏構(gòu)造分辨率進(jìn)行研究,分析不同影響因素對低幅度構(gòu)造識別的影響。針對小斷層的識別,采用屬性融合的方式指導(dǎo)、驗(yàn)證小斷層解釋方案的可靠性。關(guān)于微起伏構(gòu)造,將橫向高分辨率的速度譜資料與縱向高分辨率的井資料有機(jī)結(jié)合,重構(gòu)侏羅系主要目的層平均速度場,進(jìn)行變速成圖,并與早期時深關(guān)系擬合法時深轉(zhuǎn)換構(gòu)造圖進(jìn)行對比,綜合利用傾角測井資料、正演模擬技術(shù)以及古地貌恢復(fù)手段,對變速成圖的結(jié)果進(jìn)行驗(yàn)證。依據(jù)變速成圖法,七克臺組一段底界新發(fā)現(xiàn)微起伏構(gòu)造2個,三間房組二段底界新發(fā)現(xiàn)微起伏構(gòu)造3個,修正先前七克臺組一段底界構(gòu)造誤區(qū)2處,修正三間房組二段底界構(gòu)造誤區(qū)3處。通過波阻抗反演、屬性分析和流體檢測技術(shù)對主要層段進(jìn)行儲層預(yù)測,尋找有利的低幅度構(gòu)造儲層。為葡萄溝-葡北地區(qū)油氣藏的不斷發(fā)現(xiàn)提供重要的理論依據(jù),同時,對于提高油氣勘探效益具有較大的實(shí)際意義。
[Abstract]:The Gougou-Pubei area is located in the west of Taibei depression of Turpan-Hami Basin. The reservoirs of the first member of Qiketai formation and the third member of Sanjianfang formation are relatively developed and rich in oil and gas resources. Under the influence of multi-stage tectonic movement, the faults are extremely developed, the overthrust tectonic belts form several small and medium-sized fault backs, and the low-amplitude structures are developed in some areas. At present, most of the large anticline structures have been drilled, and most wells have obtained industrial oil flow, but the exploration degree of low amplitude structure is relatively low, so the low amplitude structure area has great prospect for exploration. With the improvement of exploration degree in the exploration area, the understanding of the structural characteristics of the Gougou-Pubei area has been deepened. After drilling, it is found that the deviation between the location of the high point of the low amplitude structure and that of the prior cognition exists-fixed, the location of the exploratory well initially drilled fails to fall on the high point, and there are still some missing low-amplitude structures that have not been recognized. Therefore, it is urgent to identify the relatively reasonable structural characteristics and identify low amplitude structures in this area. Based on the 3D seismic data of the continuous segment in the Gougou and Pubei area, the main target layers from Tertiary to Jurassic are carefully interpreted, the characteristics of fault development are studied, and the reservoir prediction is carried out for the main oil and gas producing zones. On the basis of the classification of downhole strata from Tertiary to Jurassic and the comprehensive calibration of seismic layers, the seismogeological sequence framework and seismic geological interpretation scheme of the main target layers in the Gougou and Pubei area are established, and the main structural forms in the study area are found out. In order to identify the low-amplitude structure more accurately, the resolution of small fault and micro-fluctuation structure was studied by forward modeling technique, and the influence of different factors on low-amplitude structure identification was analyzed. The method of attribute fusion is used to verify the reliability of the interpretation scheme for small faults. Regarding the micro-undulating structure, the horizontal high resolution velocity spectrum data and the vertical high resolution well data are combined organically to reconstruct the average velocity field of the main target layer of the Jurassic system, and the variable velocity mapping is carried out. The results of variable velocity mapping are verified by using dip logging data, forward modeling technology and paleogeomorphological restoration method. According to the method of variable velocity mapping, two new micro-undulating structures were found in the bottom boundary of the first section of Qiketai formation, and three new micro-undulating structures were found in the bottom boundary of the second member of the Sanjianfang formation, and 2 misunderstandings of the bottom boundary structure of the first section of the Qiketai formation were corrected. To correct 3 mistakes in the bottom boundary structure of the second stage of Sanjianfang formation. Through wave impedance inversion, attribute analysis and fluid detection techniques, the reservoir of the main formation is predicted to find favorable low-amplitude structural reservoir. It provides an important theoretical basis for the continuous discovery of oil and gas reservoirs in the Gougou and northern Portugal area and has great practical significance for improving the efficiency of oil and gas exploration.
【學(xué)位授予單位】：西南石油大學(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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