普光气田层序地层格架与储层发育特征
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摘要
综合利用露头、岩心、测井和地震资料,对川东断褶带普光气田飞仙关组、长兴组储层进行了高频层序分析、沉积相预测和有利储集带预测。将长兴组划分为2个三级层序、6个四级层序和10个五级层序;飞仙关组划分为2个三级层序、8个四级层序和19个五级层序。在三级层序的层面上,论述了层序特征,进行了沉积相预测;该区储集空间主要为溶蚀孔隙,储层发育具有明显相控性,高能环境下的颗粒灰岩经白云化形成的孔隙远高于低能环境下地层的孔隙;鲕滩和生物礁基本上都经历了较好的暴露和溶蚀,一般孔隙发育较好;斜坡、陆棚、泻湖及潮坪多发育高放射性的泥岩,孔隙不发育。
Comprehensively using the data of outcrops,cores,well log and seismics,this paper analyzes the high-frequency sequence of Feixianguan Formation and Changxing Formation reservoirs on the fault-fold belt of Puguang Gas Field in eastern Sichuan.The sedimentary facies and favorable reservoir are predicted.Changxing Formation is divided into two third-order sequences,six fourth-order sequences and ten fifth-order sequences.Feixianguan Formation is divided into two third-order sequences,eight fourth-order sequences and nineteen fifth-order sequences.In third-order sequence level,the sequence characteristics are discussed and the sedimentary facies are predicted.The pore space of this area is primarily corrosion pores and the reservoir development has obvious phase-controlled features.The porosity of granular limestone generated by dolomitization in high-energy environment is much higher than that one generated in low-energy environment.Oolitic beach and reef basically go through better exposure and corrosion with well-developed porosity and the highly radioactive mudstone appears on the slope,shelf,lagoon and tidal flat,where the pores are not developed.
Comprehensively using the data of outcrops,cores,well log and seismics,this paper analyzes the high-frequency sequence of Feixianguan Formation and Changxing Formation reservoirs on the fault-fold belt of Puguang Gas Field in eastern Sichuan.The sedimentary facies and favorable reservoir are predicted.Changxing Formation is divided into two third-order sequences,six fourth-order sequences and ten fifth-order sequences.Feixianguan Formation is divided into two third-order sequences,eight fourth-order sequences and nineteen fifth-order sequences.In third-order sequence level,the sequence characteristics are discussed and the sedimentary facies are predicted.The pore space of this area is primarily corrosion pores and the reservoir development has obvious phase-controlled features.The porosity of granular limestone generated by dolomitization in high-energy environment is much higher than that one generated in low-energy environment.Oolitic beach and reef basically go through better exposure and corrosion with well-developed porosity and the highly radioactive mudstone appears on the slope,shelf,lagoon and tidal flat,where the pores are not developed.
引文
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[2]马永生,郭旭升,郭彤楼,等.四川盆地普光大型气田的发现与勘探启示[J].地质论评,2005,51(4):477-480.Ma Yongsheng,Guo Xusheng,Guo Tonglou,et al.Discovery of thelarge-scale Puguang Gas Field in the Sichuan Basin and itsenlightenment for hydrocarbon prospecting[J].Geological Review,2005,51(4):477-480.
[3]马永生,牟传龙,郭彤楼,等.川东北地区飞仙关组层序地层与储层分布[J].矿物岩石,2005,25(4):73-79.Ma Yongsheng,Mou Chuanlong,Guo Tonglou,et al.Sequencestratigraphy and reservoir distribution of Feixianguan Formation innortheastern Sichuan[J].Journal of Mineralogy and Petrology,2005,25(4):73-79.
[4]马永生,牟传龙,郭彤楼.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):179-185.Ma Yongsheng,Mou Chuanlong,Guo Tonglou.Sequence stratigraphyand reservoir distribution of the Changxing Formation in northeastern Sichuan Basin[J].Earth Science Frontiers,2005,12(3):179-185.
[5]Van Wagoner J C,Posaentier H W,Mitchum R M,等.层序地层学基础综述和关键定义[C]//威尔格斯C K.层序地层学原理:海平面变化综合分析.徐怀大,译.北京:石油工业出版社,1993:49-55.Van Wagoner J C,Posaentier H W,Mitchum R M,et al.Basic reviewand key definition of sequence stratigraphy,Principles of sequencestratigraphy[C]//Wilgus C K.The comprehensive analysis of sea levelchanges.Xu Huaida,translated.Beijing:Petroleum Industry Press,1993:49-55.
[6]尹太举,张昌民,李中超,等.层序地层学在油田开发中的应用实践[J].沉积学报,2005,23(4):664-671.Yin Taiju,Zhang Changmin,Li Zhongchao,et al.Application ofsequence stratigraphy to improving mature oil field recovery[J].Acta Sedimentologica Sinica,2005,23(4):664-671.
[7]罗光文,梅冥相,苏德辰.露头碳酸盐岩旋回层序的识别与划分[J].石油勘探与开发,1998,25(2):13-16.Luo Guangwen,Mei Mingxiang,Su Dechen.Recognition and divisionof carbonate cyclic sequence in outcrops[J].Petroleum Explorationand Development,1998,25(2):13-16.
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