發(fā)布時間：2018-04-07 15:26

  本文選題：鄂爾多斯盆地　切入點：延長組　出處：《西北大學》2015年碩士論文

【摘要】：本文以鄂爾多斯盆地中生界延長組為例,主要研究了古構造演化與油氣成藏之間的關系,并結(jié)合烴源巖分布范圍、大型有利儲集體以及古構造演化預測了大型有利油氣區(qū)的分布。本次研究主要取得以下認識：通過大量鉆井地層對比和定量恢復各期地層沉積厚度和剝蝕厚度等,制作分析了延長組長7頁巖生油時的儲層頂面古構造形態(tài)。并在前人研究基礎上開展了延長組烴源巖厚度展布分析、大型三角洲-重力流儲集體展布分析和異常壓力分析等,探討了它們對大型含油區(qū)的控制作用。晚白堊世是延長組烴源巖大量生烴和油氣運聚時期,本文主要恢復了長6、長8儲層在中侏羅世末、早白堊世末和現(xiàn)今的構造面貌。將已發(fā)現(xiàn)油田與早白堊世末長6的頂面構造疊合,發(fā)現(xiàn)大油田分布主要受生烴巖范圍和大型三角洲-重力流儲集體的控制,而與早白堊世末長6的頂面構造關系不很明顯。經(jīng)過不同高低古構造位置的部分儲量豐度和單井產(chǎn)量、原始含油飽和度統(tǒng)計比較可以看出,由于在成藏期存在較大的古構造高差和油氣運聚動力,早白堊世末長6的頂面構造高部位的油藏含油飽和度、單井產(chǎn)量和儲量豐度稍偏高。但總體而言,古構造與大油田的關系的密切程度不如烴源巖厚度和大型儲集體分布那樣明顯。根據(jù)以上大油田形成與分布的控制因素,可以圈定預測大型有利含油區(qū)。在延長組湖盆三套烴源巖分布范圍內(nèi),將不同時期的大型三角洲-重力流儲集體分布區(qū)與古、今鼻凸軸線所圈定的重合區(qū)確定為Ⅰ類大型油田分布區(qū)；將湖盆內(nèi)大型三角洲儲集體單獨發(fā)育區(qū)確定為ⅡA類油田分布區(qū)；將湖盆內(nèi)古、今鼻凸軸線所圈定的有利油氣聚集區(qū)確定為ⅡB類油田分布區(qū),；其余生烴巖分布區(qū)為Ⅲ類油田分布區(qū)。
[Abstract]:Taking the Yanchang formation of Mesozoic in Ordos Basin as an example, this paper mainly studies the relationship between paleotectonic evolution and hydrocarbon accumulation, and combines with the distribution range of source rocks.Large favorable reservoirs and paleotectonic evolution predict the distribution of large favorable oil and gas regions.The main results of this study are as follows: through a large number of drilling strata correlation and quantitative recovery of sedimentary thickness and denudation thickness of each stage, the paleotectonics of the top surface of Yanchang No. 7 shale are made and analyzed.On the basis of previous studies, the thickness distribution analysis of source rocks in Yanchang formation, the distribution analysis of large deltaic gravity flow reservoirs and the analysis of abnormal pressure are carried out, and their controlling effects on large oil bearing areas are discussed.The late Cretaceous is the period of hydrocarbon generation and hydrocarbon migration and accumulation of source rocks in Yanchang formation. The structural features of Chang 6 and Chang 8 reservoirs in late Middle Jurassic, late early Cretaceous and present day are mainly restored in this paper.It is found that the distribution of large oil fields is mainly controlled by the range of hydrocarbon generating rocks and the large delta gravity flow reservoir, but not by the top structure of Chang6 at the end of early Cretaceous.Through the statistical comparison of reserves abundance and single well production at different positions of paleotectonics, the statistical comparison of original oil saturation shows that there are large paleotectonic height differences and hydrocarbon migration and accumulation dynamics in the reservoir forming period.The oil saturation, single well production and reserve abundance of the reservoir with high top structure at the end of the early Cretaceous are slightly higher.Generally speaking, the relationship between paleotectonics and large oil fields is not as close as the thickness of source rocks and the distribution of large reservoirs.According to the controlling factors of the formation and distribution of the large oil fields above, the large favorable oil bearing areas can be predicted.Within the distribution range of three sets of hydrocarbon source rocks in the lake basin of Yanchang formation, the distribution area of large deltaic gravity flow reservoir in different periods and paleo, the overlap area delineated by the present nose convex axis is determined to be the distribution area of type I large oil fields.The large delta reservoir development area in the lake basin is determined to be the distribution area of class 鈪，

本文編號：1719762