地震沉积学在有利砂体预测方面的应用——以三肇地区XS14区块扶余油层为例
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摘要
三肇凹陷扶余油层是松辽盆地北部重点的油气勘探领域,其沉积的河道砂体有单层厚度薄、侧向变化快的特点,因此亟需对该区域开展有利砂体预测方面的研究,以指导岩性油气藏勘探。以XS14区块为例,针对窄小河道砂体识别问题,开展了地质-地震综合研究。以地震沉积学理论为指导,分析区块内目的层段的沉积相类型,运用地震属性和储层反演等手段,刻画区块内重点层段沉积相平面展布,预测区块内有利砂体分布。研究表明,研究区为一套浅水三角洲沉积,由下至上水体逐渐加深,其中FⅡ1小层沉积期河道砂体厚度大,分布较为连续,为良好的储集层,最终预测下一步勘探开发的目标区位于中部和西北部。
Fuyu Reservoir of Sanzhao Area in the Northern Songliao Basin was one of the important oil-gas exploration areas.The single layer thickness of channel sand body was thin and its lateral change was quick,it is urgent to study the sedimentary sand body prediction in this area to guide the exploration of lithologic reservoirs.By taking Block XS14 as an example,in allusion to the problem of narrow and small channel sand body recognition,the research on seismics-geology was carried out.Guided by seismic sedimentology theory,the sedimentary facies types of the target layers were analyzed in the block,combined with seismic attribution and inversion,the plane distribution of sedimentary facies in the major reservoirs was emphatically depicted and the distribution of favorable sand body in the area was predicted in detail.The results show that the main type of sedimentary facies is shallow water delta deposition.In vertical direction,the water body changes from shallow to deep.At the sedimentary stage of FⅡ1 sublayer,the channel sand body is at max thickness and the distribution is continuous,which may be regarded as an favourable reservoir.The central and northwest parts are determined as the targets for further exploration and development.
Fuyu Reservoir of Sanzhao Area in the Northern Songliao Basin was one of the important oil-gas exploration areas.The single layer thickness of channel sand body was thin and its lateral change was quick,it is urgent to study the sedimentary sand body prediction in this area to guide the exploration of lithologic reservoirs.By taking Block XS14 as an example,in allusion to the problem of narrow and small channel sand body recognition,the research on seismics-geology was carried out.Guided by seismic sedimentology theory,the sedimentary facies types of the target layers were analyzed in the block,combined with seismic attribution and inversion,the plane distribution of sedimentary facies in the major reservoirs was emphatically depicted and the distribution of favorable sand body in the area was predicted in detail.The results show that the main type of sedimentary facies is shallow water delta deposition.In vertical direction,the water body changes from shallow to deep.At the sedimentary stage of FⅡ1 sublayer,the channel sand body is at max thickness and the distribution is continuous,which may be regarded as an favourable reservoir.The central and northwest parts are determined as the targets for further exploration and development.
引文
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[4]陈伟,刘大锰,彭承文,等.大庆油田肇35区块葡萄花油层沉积微相分布演化规律及有利相带预[J].现代地质,2010,24(6):1072~1079.
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[8]游瑜春,魏水建,郭华军,等.地震相分析在碳酸盐岩沉积相研究中的应用——以川东北地区PG气田为例[J].石油天然气学报(江汉石油学院学报),2010,32(6):248~251.