焉耆盆地本布图、宝浪油田地震地质综合研究与有利目标选择
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摘要
焉耆盆地本布图、宝浪油田于1996年开发以来,经过轰轰烈烈的上产,高效储量已基本动用完毕,目前一方面是在原有基础上如何提高原储量动用程度,另一方面是对未动用储量进行评价,力争每年投入一定的新储量;同时围绕油田进行滚动扩边,积极寻找新储量,为稳产和上产奠定基础。本布图、宝浪油田从构造成因上属于高陡构造油气藏,目前仅通过地震资料还无法准确地对高陡构造进行一个全面的了解,高陡构造地震波速度横向上变化剧烈导致深层构造畸变严重,解释人员对于深层构造的性质和类型的认识存在着较大差异,这对高陡构造油气藏在开发过程中断层位置的确定也带来一定的困难,正是由于断层、构造位置的不确定性对圈闭边界带来了很大的不确定性。因此在滚动勘探过程里,需要进行地震、地质综合研究,进而准确地把握油气藏特点,减少开发风险,获取最大的效益。研究此类油气藏的有效储层分布、油气藏控制因素及对开发的影响,将对此类油气藏开发具有重要的指导意义。
     论文针对本布图油田通过层位及小层划分、层位精确标定技术、二维三维地震资料解释、速度陷井研究、储层反演、储层岩性特征、重矿物分析、以及试油试采资料的综合分析,对本布图油田的地层、构造、油层控制因素进行了深入的分析,建立了本布图焉2区块油田具有两个沉积洼子、两个物源砂体的地质认识,油层分布受构造,储层物性以及边水能量的控制,并且得出两个不同物源方向的砂体地质能量存在着较大差异。针对于宝浪油田宝北区块如何进一步的滚动勘探问题,在地层对比基础上对宝北区块储层展布及滚动挖潜层位进行了研究。通过对储层岩矿资料、测井资料、取心岩性描述、生产动态资料综合分析,结合储层等厚图和地层等厚图的研究,从而搞清了该区块的沉积物源、沉积特征、储层展布及砂体的连通性,为高陡构造油气藏开发提供了技术支持。
     首次在焉耆盆地宝浪油田宝北区块提出风化壳概念,并为此开展了下第三系地层与侏罗系地层重新对比划分。通过钻时曲线对比、沉积环境和岩性特征、电性特征、分析化验资料、原油性质、渗透率分析对比,以及油气聚集规律的研究,把原认为下第三系含油地层归为侏罗系地层,使含油层位和油藏类型趋于简单化,明确了下步挖潜的方向。
The high efficiency reserves have been explored and developed since 1996 in Benbutu and Baolang Oil Field , Yanqi Basin. The question is how to explore and develop the original reservoir in the one hand , in the other hand is how to evaluate unused reserves . The answer to the question is to find some new reservoirs . The useful methods is to use rolling exploration to find new reserves effectively for raising production. Benbutu and Baolang Oil Field belong to high-steep conformation reservoirs , we can’t identify clearly high-steep structure just by seismic interpretation. The strenuous change of seismic-wave velocity makes deep structure unreasonably and interpreters hold different opinions about the mode of deep structure. The uncertainty of faults and structure bring the uncertainty to the boundary of trap. Therefore, the method of using seismic and geology for comprehensive research is a good way to identify the feature of reservoir, reduce development risk , and get maximum benefit. The research to this kind of available reservoir distribution, control factor for the development affection will give a hand to the other kind of reservoirs. The paper do detailed research on the strata, structure, reservoir control factor about the Benbutu Oil field by division and correlation of sub-strata , seismogeological horizon calibration , 2D/3D seismic interpretation, the research of velocity pitfall , inversion , lithologic character, heavy mineral, well testing and producing test. The findings is there are two different low-lying depositional environment , two different provenances. The distribution of reservoir is controlled by structure , physical property and edge water energy ; the energy of two different provenances in sand body is different.
     The paper about the following explore and develop in Baobei Block , Baolang Oil Field do research on reservoir distribution and tapping potential horizons based on correlation of strata. The findings of sediment provenance , sediment feature , distributaion of reservoir and connectivity of sand body are got by rock constituents, log, boring with sampling, production performance , reservoir isopachous map , strata isopachous map. This technology are ensured for the exploration and development of high-steep structure.
     The paper put forward to the conception of weathered crust for the first time in BaobeiBlock , Baolang Oil Field , Yanqi Basin and do correlation of sub-strata for Eogene system and Jurassic system. The findings is that the strata , which belonged to Eogene system, should be Jurassic system by the research of drilling time log , sedimentary environment, lithologic features, electrical property, analytic and assay materials , crude oil property, permeability , the rule of hydrocarbon accumulation; and simples oil-bearing horizon and reservoir fluid properties , gets clearly the following method of exploration and development.
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