摘要
准噶尔盆地油气资源潜力巨大,是我国西北地区重要的油气区,已成为我国陆上石油资源的战略接替区之一。位于准噶尔盆地西缘的车排子地区前期勘探见到良好的油气显示,综合分析认为其具有良好的油气源条件和勘探远景。本文以车排子地区沙湾组为研究对象,运用层序地层学、沉积学等理论和方法,进行了层序地层格架的建立、沉积体系研究、地震储层的预测和储层孔隙结构的分析,确定了储层的类型。在此基础上,通过有利砂体描述、圈闭类型和储盖组合分析,预测了有利区带,从而指出有利勘探方向。
主要取得了以下成果和认识:
(1)实现了研究区沙湾组在地震、测井、钻井资料方面层序地层划分的一致性,将沙湾组划分为两个3级层序,建立层序地层格架;
(2)认为层序Ⅰ为辫状河三角洲前缘亚相,分为水下分流河道、远砂坝和水下分流间湾微相;层序Ⅱ主要为滨浅湖亚相,分为滩坝和滨浅湖泥微相;水下分流河道和滩坝微相具有很好的勘探前景;
(3)发现储层碎屑组分为石英、长石、云母和岩屑,主要成岩作用有压实、胶结、交代及溶蚀作用,孔隙类型主要为粒间孔,其次为粒内孔及微裂隙;分析总结出大孔粗吼型等4种微观孔隙结构类型;并将砂岩储层划分为由好到差的四种类型;
(4)对排6井区三维地震和西部二维地震区沙湾组砂体进行了预测,指出砂体主要分布于研究区中南部;
(5)指出车排子地区沙湾组发育6个有利区带,其中有利区带2和有利区带3条件最为优越,预测结果与实际勘探结果吻合较好。
The oil and gas resources in Junggar Basin has a large potential, it’s a important oil and gas area in the northwest of our country, it has become one of the strategic replacement to China’s onshore oil resources. Located at the western margin of the Junggar Basin, the Chepaizi raised oil and gas and to see a good show in the early exploration, comprehensive analysis of it has good conditions for oil and gas resources and exploration prospects. The thesis is focused on the Shawan formation of Chepaizi areas. Using Sequence stratigraphy, sedimentology, and other methods and theories, Established sequence stratigraphic framework, sedimentary system research, seismic reservoir prediction and reservoir pore structure analysis, and then the type of reservoir would be dicided. Based on these studies, by description of favorable sand, analysis of trap type, distribution of Combination of reservoir, predicted the distribution of favorable areas and subtle reservoirs, Thus specified the direction of exploration.
Several achievements have been obtained as follows:
First, realized the consistency of sequence stratigraphy divide about of seismic, logging, drilling information, put Shawan formation into two three sequence, established sequence stratigraphic framework.
Second, there is braided delta front intrafacies in sequenceⅠ, and it is subdivided to distributary channel underwater, distal bar, bay between distributary channels underwater. There is offshore-shallow lacustrine intrafacies in sequenceⅡ, and beach bar and mud in offshore-shallow lake are subdivided from it. distributary channel underwater and beach bar have good exploration potential.
Third, scrap components contains quartz, feldspar, mica and lithic. Compaction, cementation, alternation, dissolution, and denudation mainly consists of diagenesis. The pore of conglomerate is the pore mianly between granule, and the pore inside granule and the the pore as micro-fracture is secondary. Megalospore and throat, and other 3 type of pore structure in microscope are generalized. And classified reservoirs into four types from good to bad.
Fourth, Pai 6 wells on the three-dimensional seismic areas and the western two-dimensional seismic areas Shawan formation sandstone was predicted, sand mainly distributed in central and southern study area.
Fifth, there were found six favorable zone, and Among them, the favorable zone 2 and zone 3 conditions conducive to the most advantageous With the actual exploration proved that prediction results will be ideal.
引文
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