四川盆地上三叠统有利储层展布与勘探方向
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摘要
四川盆地上三叠统须家河组是中国石油西南油气田公司的重点勘探接替层系,随着勘探形势的变化,需要以全盆地为单元,弄清各储集砂体的平面展布规律及其勘探潜力。综合分析地震、测井、录井和野外露头资料,将须家河组划分为4个三级层序、12个体系域;以体系域为单元编制了全盆地须家河组沉积微相展布图,指出须家河组形成了6大三角洲砂体,有利储集砂体主要分布于低位体系域,主要为三角洲前缘水下分支河道砂体;而水进和高位体系域湖泊相沉积发育,砂体规模较小。综合考虑各砂体的分布面积、生烃强度、资源潜力、储层类别、勘探现状及顶面埋深等条件,对须家河组进行了勘探潜力综合评价,指出了下一步的勘探方向:①须二段应集中在广安—营山和蓬莱—金华2个砂体上;②须四段应集中在蓬莱—金华、安岳—合川2个砂体上;③须六段则应集中在勘探程度相对较低的蓬莱—金华、宜宾—观音场和古蔺—泸州砂体上。
The Upper Triassic Xujiahe Formation in the Sichuan Basin is critical to reserve replacement of PetroChina Southwest Oil and Gas Field Company.Along with the developing trend of hydrocarbon exploration,the areal distribution and exploration potential of each sandbody should be appraised with the whole basin as a unit.Based on an integrated analysis of seismic,log and outcrop data,the Xujiahe Formation is divided into 4 third-order sequences and 12 system tracts.The sedimentary microfacies of the Xujiahe Formation are mapped in the whole basin with the system tracts as units.Six major delta sandbodies are identified in the Xujiahe Formation.The favorable reservoir sandbodies are mainly developed in the lowstand system tract and are mostly delta-front underwater distributary channel sands.In contrast,the small sandbodies of lake facies are well developed in the transgressive and highstand system tracts.The exploration potential of the Xujiahe Formation is comprehensively appraised with multiple parameters including areal distribution,hydrocarbon generation intensity,resource potential,reservoir types,exploration maturity and top burial depth of reservoirs.Several exploration targets are recognized,such as the Guangan-Yingshan and Penglai-Jinhua sandbodies in the second member of the Xujiahe Formation,the Penglai-Jinhua and Anyue-Hechuan sandbodies in the fourth member of the Xujiahe Formation,as well as the Penglai-Jinhua,Yibin-Guanyinchang and Gulan-Luzhou sandbodies in the sixth member of the Xujiahe Formation.
The Upper Triassic Xujiahe Formation in the Sichuan Basin is critical to reserve replacement of PetroChina Southwest Oil and Gas Field Company.Along with the developing trend of hydrocarbon exploration,the areal distribution and exploration potential of each sandbody should be appraised with the whole basin as a unit.Based on an integrated analysis of seismic,log and outcrop data,the Xujiahe Formation is divided into 4 third-order sequences and 12 system tracts.The sedimentary microfacies of the Xujiahe Formation are mapped in the whole basin with the system tracts as units.Six major delta sandbodies are identified in the Xujiahe Formation.The favorable reservoir sandbodies are mainly developed in the lowstand system tract and are mostly delta-front underwater distributary channel sands.In contrast,the small sandbodies of lake facies are well developed in the transgressive and highstand system tracts.The exploration potential of the Xujiahe Formation is comprehensively appraised with multiple parameters including areal distribution,hydrocarbon generation intensity,resource potential,reservoir types,exploration maturity and top burial depth of reservoirs.Several exploration targets are recognized,such as the Guangan-Yingshan and Penglai-Jinhua sandbodies in the second member of the Xujiahe Formation,the Penglai-Jinhua and Anyue-Hechuan sandbodies in the fourth member of the Xujiahe Formation,as well as the Penglai-Jinhua,Yibin-Guanyinchang and Gulan-Luzhou sandbodies in the sixth member of the Xujiahe Formation.
引文
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[10]王宓君.中国石油地质志:卷十[M].北京:石油工业出版社,1987:67-69.
[2]魏国齐,刘德来,张林,等.四川盆地天然气分布规律与有利勘探领域[J].天然气地球科学,2005,16(4):437-442.
[3]杨威,魏国齐,李跃纲,等.川西地区须家河组二段储层发育的主控因素和致密化时间探讨[J].天然气地球科学,2008,19(6):796-800.
[4]杨威,魏国齐,李跃纲,等.川西地区须家河组二段成岩作用及其对储层发育的影响[J].天然气地球科学,2008,19(2):188-192.
[5]金惠,杨威,杨跃明,等.川西地区须二段高分辨率层序地层研究[J].天然气工业,2007,27(6):48-52.
[6]施振生,金惠,郭长敏,等.四川盆地上三叠统须二段测井沉积相研究[J].天然气地球科学,2008,19(3):339-346.
[7]郭正吾,邓康龄,韩永辉.四川盆地形成与演化[M].北京:地质出版社,1996:70-116.
[8]施振生,杨威,金惠,等.川中—川南地区上三叠统沉积相研究[J].沉积学报,2008,26(2):211-220.
[9]侯方浩,蒋裕强,方少仙,等.四川盆地上三叠统香溪组二段和四段砂岩沉积模式[J].石油学报,2005,26(2):30-37.
[10]王宓君.中国石油地质志:卷十[M].北京:石油工业出版社,1987:67-69.
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