【作者】 樊春艳；

【导师】 柳成志；

【作者基本信息】 东北石油大学 ， 矿产普查与勘探， 2011， 硕士

【摘要】 本文综合采用层序地层学、地震地层学、沉积学等最新理论和方法,通过岩心观察描述,运用地震、测井、录井等分析资料,对乌尔逊凹陷乌北次洼南屯组的层序特征、沉积相及其展布特征及进行了深入细致的分析和研究。同时,结合乌尔逊凹陷乌北地区构造地质特征,对该区域的沉积特征进行了研究,并对有利相带的分布进行了预测。本次研究能为该区域层序的划分提供可靠的依据,对今后该区油气勘探与开发提供一定的理论支持,具有重要的指导意义和借鉴价值。本次研究将南屯组划分为2个三级层序、7个四级层序,且每个三级层序内部各个体系域均发育完全,两个三级层序的分界面位于岩性和电性的转换面,界面之下局部削截,界面之上为上超。本次研究利用地震、录井、测井、岩心等资料,并结合对沟谷、坡折带、同沉积断层的研究,辅以对地震属性、地层及砂岩的分布特征、重矿物分布特征的分析,确定研究区南屯组沉积时期,主要发育有辫状河三角洲相、扇三角洲相、湖泊相,部分发育湖底扇相及火山岩相,并且确定了四级层序内沉积体系的展布特征,明确了乌北次洼沉积模式。综合考虑生、储、盖及生储盖组合特征等油藏形成的基本条件以及砂体的展布并结合目前油气勘探成果,预测出研究区内的有利区带。更多还原

【Abstract】 Based on the most newest theories and methods of Sequence Stratigraphy, Seismic Stratigraphy and Sedimentology, the sequence characteristics as well as sedimentary facies distributions in NanTun Formation in the Northern area of WuErxun Depression were analyzed and researched in detail in this paper, integrated with sufficient cores observation, and seismic, logging data analyzing. Moreover, combined with the structural geology features of that area, sedimentary characteristics researching and favorable facies belt distribution prediction were also processed. Consequently, abundantly reliable basises for sequence division could be achieved in this paper, which can definitely provide great supportions for the future exploration and development in that area.NanTun formation was classified into two third-order sequences, and seven fourth-order sequences elaborately in this paper. Some likely aspects can be illustrated:Firstly, completedly developed system domains exist in each third-order sequence. Secondly, the interface of two adjacent sequences shows evident lithology and electrical conversion. Finally, these sequence interfaces are partly truncated underside, and onlaped above.Based on seismic, logging and core data, combined with the studies of gully, slope break and synsedimentary fault, integrated with the analysis of seismic attributes, stratum and sandstone distribution, as well as heavy mineral characteristics, the conclusion that four mainly facies including braided fluvial delta facies, fan-delta facies and lacustrine facies, as well as two secondary facies compsed of volcanic facies and lake fan facies, were developed in the NanTun formation, have be arrived. Furthermore, the depositional system distributions of the fourth-order sequence, as well as the depositional patterns in the northern area of WuErxun Depression were also identified in this paper.At last, based on the comprehensively analysis of basic hydrocarbon accumulation conditions such source bed, reservoir area, cap rock and so on, as well as the sandstones distribution and other researching results, the favorable belt in this area was predicted.更多还原