【摘要】：研究工區(qū)位于西部凹陷西斜坡的中南部位,西起西斜坡下臺階,東至清水洼陷。西斜坡潛山僅在歡喜嶺、齊家、杜家臺山、勝利塘、曙光潛山預(yù)測探明石油地質(zhì)儲量,多集中在中、高潛山帶上,而對于深層潛山及已探明潛山的內(nèi)幕深層存在儲量空白區(qū),西部凹陷中南部古近系勘探程度較高,古近系有利目標(biāo)尋找和落實的難度日益增大,而潛山勘探程度相對較低,有利勘探面積大,西部凹陷中南部潛山層系多樣,既有太古宇、元古界,又有中生界。油藏類型多樣,有侵蝕殘山型油藏和斷塊山型油藏,不同時期及不同類型的潛山成藏條件不同。由于西斜坡潛山油藏類型不同,形成條件多樣,巖性變化的復(fù)雜性,油氣水分布的難以確定,影響著西部凹陷的潛山勘探進(jìn)程。本論文的開展是以構(gòu)造解釋為主,成藏條件分析為輔,在構(gòu)造解釋中綜合利用了測井、地震、鉆井及分析化驗等資料,進(jìn)行精細(xì)的構(gòu)造解釋和儲層特征的分析,通過構(gòu)建貫穿工區(qū)東西南北的幾條地質(zhì)剖面,建立地震解釋的宏觀格架,通過測井標(biāo)定及VSP確定中深層的潛山頂界面,在井間及缺少井的地區(qū),以地震的預(yù)測為主,并結(jié)合屬性分析共同確定。通過構(gòu)造演化及斷層生長指數(shù)的分析,認(rèn)為潛山圈閉在第三系前形成雛形,主成長期為沙四期,定型于沙三期。有利目標(biāo)區(qū)圈閉受早期斷裂的有利改造,不受晚期斷裂的影響。在儲層條件分析中,深大的斷裂,充足的油源及潛山內(nèi)幕的隔層為潛山內(nèi)幕的成藏成為可能。結(jié)合前人的認(rèn)識分析研究區(qū)的變質(zhì)巖的巖性類型,確定預(yù)測的潛山的巖性為混合花崗巖和片麻巖在優(yōu)勢巖性序列中較輝綠巖及角閃巖具有一定的成藏優(yōu)勢,裂縫是潛山及內(nèi)幕成藏的關(guān)鍵,通過臨井資料的分析,認(rèn)為本研究區(qū)的裂縫相對較發(fā)育,易于形成裂縫式儲層,潛山的上覆的砂三及砂四段地層厚度大,泥巖發(fā)育,可作為本區(qū)域的蓋層,同時也可以作為研究區(qū)域有利的烴源巖。優(yōu)選的目標(biāo)在馬南潛山區(qū),根據(jù)以前的資料的對供油窗口的討論,在提出的目標(biāo)區(qū)中存在較大的供烴幅度,利于目標(biāo)區(qū)的成藏。根據(jù)本區(qū)的成藏類型及所處的位置,劃分為兩種成藏模式,理論上討論了有利目標(biāo)的成藏的可能性。最后對目標(biāo)區(qū)進(jìn)行了烴類檢測,輔助分析目標(biāo)區(qū)潛山風(fēng)化殼及內(nèi)幕的成藏具有一定的效果。綜合以上的研究,總結(jié)研究區(qū)潛山油藏特征及分析油氣成藏控制因素,劃分潛山油藏類型,確定潛山成藏模式；落實潛山構(gòu)造形態(tài)及斷裂展布,搞清潛山巖性組合、分布以及儲層控制因素,確定潛山與有效烴源巖的接觸關(guān)系,從而優(yōu)選有利目標(biāo),提出建議井位。
[Abstract]:The study area is located in the central and southern part of the west slope of the western sag, rising from the west slope to the lower steps, and from the east to the clear water sag. The buried hills on the west slope are only located in Huanxiling, Qijia, Dujiatai, Shengtang and Shuguang buried hills to predict the proven oil geological reserves, most of which are concentrated in the middle and high buried hill zones, but there are blank areas in the deep buried hills and the deep layers of the proven buried hills. The exploration degree of Paleogene in the central and southern part of the western sag is relatively high, and the difficulty of finding and implementing the favorable targets of the Paleogene is increasing day by day, while the exploration degree of buried hill is relatively low, and the favorable exploration area is large. The Proterozoic and Mesozoic. There are various types of reservoirs, including eroded residual mountain reservoirs and fault-block mountain reservoirs, and different reservoir forming conditions of buried hill in different periods and types. Because of the different types of buried hill reservoirs on the west slope, various formation conditions, complexity of lithologic changes and difficulty in determining the distribution of oil, gas and water, the process of buried hill exploration in the western sag is affected. The development of this paper is based on structural interpretation, supplemented by reservoir forming condition analysis. In the structural interpretation, comprehensive use of logging, seismic, drilling and analysis of laboratory data, for fine structural interpretation and reservoir characteristics analysis, By constructing several geological sections running through the north and south of the east, west and east of the working area, establishing the macroscopic frame of seismic interpretation, and determining the top interface of the buried hill in the middle and deep layers by logging calibration and VSP, earthquake prediction is the main factor in the cross-well area and the area where the wells are lacking. And combined with attribute analysis to determine. Based on the analysis of tectonic evolution and fault growth index, it is considered that buried hill traps formed embryonic form before Tertiary system, and the main growth period is the fourth stage of sand, which is fixed in the third stage of sand. The traps in favorable target areas are not affected by late faults but by the favorable transformation of early faults. In the analysis of reservoir conditions, it is possible that the deep fault, sufficient oil source and the interlayer of buried hill interior are the accumulation of buried hill insider. In combination with the previous understanding and analysis of the lithologic types of metamorphic rocks in the study area, it is determined that the predicted lithology of buried hills is migmatite and gneiss, which has a certain predominance over diabase and amphibolite in the dominant lithologic sequence. Fracture is the key of buried hill and inside reservoir formation. By analyzing the data of adjacent wells, it is considered that the fractures in this research area are relatively developed and easy to form fractured reservoirs, and the overlying sand 3 and sand 4 member of buried hill have large formation thickness and mudstone development. It can be used as the caprock in the region and as a favorable source rock in the study area. The target of optimal selection is in Manan buried hill area. According to the discussion of oil supply window of previous data, there is a large range of hydrocarbon supply in the proposed target area, which is conducive to the formation of reservoir in the target area. According to the type and location of reservoir formation in this area, two types of reservoir forming models are divided, and the possibility of reservoir formation of favorable target is discussed theoretically. Finally, hydrocarbon detection is carried out in the target area, and it is effective to analyze the accumulation of weathering crust and inside of buried hill in the target area. Based on the above studies, the characteristics of buried hill reservoirs in the study area are summarized and the controlling factors of hydrocarbon accumulation are analyzed, the types of buried hill reservoirs are classified, and the model of buried hill reservoir formation is determined. The structural morphology and fault distribution of buried hill are carried out, lithologic assemblages, distribution and reservoir control factors of buried hill are made clear, the contact relationship between buried hill and effective source rock is determined, so as to select favorable target and propose well location.
【學(xué)位授予單位】：長江大學(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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