川西坳陷斜坡带蓬莱镇组三段沉积特征与储层分布——以什邡地区JP_2~3砂组为例
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摘要
川西什邡地区蓬莱镇组三段(简称"蓬三段")气田具有良好的开发潜力。综合利用岩心观察、薄片、物性、压汞等资料,结合测井解释、储层及含气性预测,对该区蓬三段的层序沉积特征及主要目的层3砂组(JP_2~3)的储层特征、分布预测与评价进行了研究,分析了有效储层发育的控制因素。结果显示,蓬三段可划分为5个砂组,各砂组厚度稳定,反映了平坦湖盆沉积的特征;根据岩相标志、相序分析浅水湖盆平缓毯式河控三角洲前缘水下分流河道是砂体发育的最有利沉积微相。JP_2~3砂组储层主要为低孔—低渗—特低渗(或近致密)孔隙型细粒岩屑砂岩。平面上JP_2~3砂组砂体展布受河道边界控制,河道砂体范围内有效储层分布相对局限,特别是一类、二类优质有效储层发育区,主要位于研究区北部和中部河道内,呈不连续条带状分布。综合分析认为,优质有效储层发育主要受有利沉积微相分布的控制,在一定程度上,也受到构造相对高部位、断裂和裂缝分布控制。
The Penglaizhen Formation 3 rd member(Peng 3 member for short)gas field has good development potential in the Upper Jurassic in Shifang area in western Sichuan Basin.Based on detailed observation from well cores,ordinary and mold thin section,porosity,permeability,mercury experiment analysis results of some samples,combined with reservoir log interpretation and seismic prediction,well seismic integration,sequence,sedimentary facies,reservoir characteristics,reservoir distribution prediction and comprehensive evaluation of Peng 2 gas-pool and main object strata 3 sandstone groups(JP_2~3)are researched in this area from Western Sichuan Depression area,and the controlling factors of effective reservoir development are analyzed.The research results show that Peng 3 member can be divided into five sand groups.The internal sandstone groups strata thickness is relatively stable,which shows that the strata were deposited in sedimentary environment of stable structure,flat lacustrine basin.Combined with the characteristics of litho-facies marks,facies sequence character analysis,logging response and seismic facies,the shallow-water river-controlling gentle blanket delta front underwater distributary channel is the most favorable sedimentary micro-facies.In JP_2~3 sandstone groups,the pore type of fine debris sandstone reservoir rocks mainly has the characteristics of low porosity,low to extra-low(or near tight)permeability.The plane distribution of sand bodies in JP_2~3 sand group is controlled by river boundary.Compared with distributary channel sand bodies,the distribution range of effective reservoirs,especially,the high-quality effective reservoirs of JP_2~3 sandstone groups are relatively limited with the discontinuous band characteristics,and are mainly located in the northern and middle channel.Comprehensive analysis shows that the key of the development of highquality and effective reservoirs is controlled by lithologic distribution of favorable sedimentary micro-facies,and to a certain extent controlled by relatively high tectonic sites,fractures and fractures.
The Penglaizhen Formation 3 rd member(Peng 3 member for short)gas field has good development potential in the Upper Jurassic in Shifang area in western Sichuan Basin.Based on detailed observation from well cores,ordinary and mold thin section,porosity,permeability,mercury experiment analysis results of some samples,combined with reservoir log interpretation and seismic prediction,well seismic integration,sequence,sedimentary facies,reservoir characteristics,reservoir distribution prediction and comprehensive evaluation of Peng 2 gas-pool and main object strata 3 sandstone groups(JP_2~3)are researched in this area from Western Sichuan Depression area,and the controlling factors of effective reservoir development are analyzed.The research results show that Peng 3 member can be divided into five sand groups.The internal sandstone groups strata thickness is relatively stable,which shows that the strata were deposited in sedimentary environment of stable structure,flat lacustrine basin.Combined with the characteristics of litho-facies marks,facies sequence character analysis,logging response and seismic facies,the shallow-water river-controlling gentle blanket delta front underwater distributary channel is the most favorable sedimentary micro-facies.In JP_2~3 sandstone groups,the pore type of fine debris sandstone reservoir rocks mainly has the characteristics of low porosity,low to extra-low(or near tight)permeability.The plane distribution of sand bodies in JP_2~3 sand group is controlled by river boundary.Compared with distributary channel sand bodies,the distribution range of effective reservoirs,especially,the high-quality effective reservoirs of JP_2~3 sandstone groups are relatively limited with the discontinuous band characteristics,and are mainly located in the northern and middle channel.Comprehensive analysis shows that the key of the development of highquality and effective reservoirs is controlled by lithologic distribution of favorable sedimentary micro-facies,and to a certain extent controlled by relatively high tectonic sites,fractures and fractures.
引文
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