杏子川油田延安组下段延7～延9油层组沉积微相及石油聚集规律研究

发布时间：2018-03-11 17:12

  本文选题：杏子川油田　切入点：延安组　出处：《西北大学》2017年硕士论文　论文类型：学位论文

【摘要】：安塞杏子川油田三叠系延长组勘探开发已进入中、后期,寻找新的开发层系已迫在眉睫。除延长组之外,侏罗系延安组也是鄂尔多斯盆地重要的含油层系。目前杏子川油田延安组油藏零星分布,关于该油田延安组石油聚集规律及油藏分布情况研究较少,认识不清;河湖相三角洲平原向三角洲前缘转化过程尚不明确。该油田延安组地层相对于延长组来说,具有勘探程度低、储层物性好、单井产量高、勘探开发潜力巨大的特点。前人研究表明,延安组地层油藏主要位于延安组下段延7～延9油层组。因此,针对该油田延安组延7～延9油层组进行沉积相研究,精细刻画延7～延9沉积期砂体展布,从而辨明石油聚集规律,对该油田下一步勘探开发新方向和油田增储上产具有重要的战略意义。本次论文研究层位为延7、延8、延9油层组。通过对研究区916 口井进行分层解释,结合钻井、录井、测井资料、分析测试资料和现场岩心观察、野外剖面观察,运用沉积学及石油地质学知识,对研究区研究层位砂体、砂地比、砂体结构、古构造平面展布特征及富县组古地貌进行研究,根据已有产油井特征,对延安组延7～延9油层组石油聚集规律及主控因素进行总结并预测有利区。研究区延安组下段延7和延8主体为三角洲前缘亚相,东北部小面积区域为三角洲平原亚相,骨架砂体为水下分流河道砂体;延9为三角洲平原亚相,骨架砂体为分流河道砂体。在砂体平面展布上,延7和延9均发育7条北东—南西向主砂带,延8发育6条北东—南西主砂带。研究区延安组含油层位开发程度较低,通过对已出油井进行研究,结合富县组古地貌及各研究层位单因素平、剖面图,总结得出研究区延安组下段延7～延9油层组油气富集主控因素为:(1)三角洲前缘(或三角洲平原)水下分流(或分流)河道主砂带展布;(2)斜坡古地貌;(3)古、今构造鼻状隆起;(4)泥岩或致密砂岩侧向遮挡。综合上述因素,对研究区延7～延9油层组进行有利区预测,优选出三个有利区,分别为:招安北部区域、砖窑湾以北区域、杏6228井区域。
[Abstract]:The exploration and development of the Triassic Yanchang formation in Ansai Xingzichuan Oilfield has entered the middle stage. Jurassic Yanan formation is also an important oil-bearing formation in Ordos basin. At present, the reservoir distribution of Yan'an formation in Xingzichuan Oilfield is sporadic. Compared with Yanchang formation, Yanan formation of this oil field has low exploration degree, good reservoir physical property and high single well production, and the process of transforming river and lacustrine delta plain to delta front is not clear. Previous studies show that the reservoir of Yan'an formation is mainly located in Yan7 ~ Yan9 reservoir of lower member of Yan'an formation. Therefore, the sedimentary facies of Yanan formation Yan7 ~ Yan9 reservoir is studied. The distribution of sand bodies during the depositional period from 7 to 9 was carefully characterized, and the oil accumulation law was identified. It is of great strategic significance for the new direction of exploration and development of this oilfield and the increase of reservoir production in the oilfield. The study horizon of this paper is Yan 7, Yan 8 and Yan 9. By means of stratified interpretation of 916 wells in the study area, combined with drilling and logging, Well logging data, analysis of test data and field core observation, field profile observation, application of sedimentology and petroleum geology knowledge, study of horizon sand body, sand to ground ratio, sand body structure, The paleogeomorphology of Fuxian formation was studied according to the characteristics of existing oil wells. The oil accumulation regularity and main controlling factors of Yanan formation Yan7 ~ Yan9 oil formation are summarized and the favorable areas are predicted. The main bodies of Yanan formation are delta front subfacies and northeast small area are delta plain subfacies, the main body of Yan'an formation is delta front subfacies, the main body of Yan'an formation is delta front subfacies, and the northeast small area of Yanan formation is delta plain subfacies. The skeleton sand body is underwater distributary channel sand body, Yan 9 is delta plain subfacies, skeleton sand body is distributary channel sand body. Yan8 has 6 main sand belts in the north, east and south west. The oil bearing horizon of Yan'an formation in the study area is relatively low. By studying the produced oil wells, combining with the paleogeomorphology of Fuxian formation and the single factor level and profile of each study horizon, It is concluded that the main controlling factors of oil and gas enrichment in Yanan formation from Yan'an formation to Yan'an formation are: 1) delta front (or delta plain) subaqueous distributary (or distributary) channel main sand belt (2) paleogeomorphology 3) paleogeomorphology) paleogeomorphology. The mudstone or tight sandstone is sideways occluded in this structure. According to the above factors, the favorable areas of Yan7 ~ Yan9 reservoirs in the study area are predicted, and three favorable areas are selected as follows: the northern area of Zhaoan, the area north of Bian Yaowan, and the area north of Bian Yaowan. Xing6228 well area.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
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本文编号：1599114