齐家地区高Ⅲ、高Ⅳ组砂岩输导层静态连通评价
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摘要
针对松辽盆地齐家地区高Ⅲ、高Ⅳ组三角洲前缘亚相砂体静态连通性定量评价的难题,综合岩心、测井和地震等资料,采用渗逾理论指导和油藏解剖验证开展砂体静态连通性定量评价。结果表明:高Ⅲ、高Ⅳ组垂向上可划分为5套单一砂岩输导层(S1—S5),受湖侵泥岩隔板遮挡影响,各单一砂岩输导层内含油砂岩比例自上而下逐渐减小;基于沉积环境差异,分别厘定出三角洲内、外前缘亚相砂体连通的渗流阈值C0(10%,5%)和完全连通系数C(60%,50%),且砂体连通概率随砂地比增大而增加;受物源供给和沉积演化影响,5套单一砂岩输导层自南向北和自下而上连通性逐渐变好,油气平面上主要分布在砂体连通概率快速增长的砂地比值30%～50%的有利区带。
Aiming at the problem of quantitative evaluation of static connectivity of delta front subfacies sandbodies in G Ⅲ-GⅣgroups in Qijia area of Songliao Basin, the core, logging and seismic data were used to quantitatively evaluate the static connectivity of sandbodies by using infiltration theory guidance and reservoir anatomy verification. The results show that the G Ⅲ-GⅣ groups are vertically divided into five sets of single sandstone carrier beds(S1-S5). Reservoir anatomy indicates that the proportion of oil-bearing sandstone in each single sandstone transport layer is gradually reduced from top to bottom due to the blockage of lake instrusive mudstone. Based on the differences in sedimentary environment, the initial connected net-to-gross threshold ratios C0(10% and 5%)and fully-connected net-to-gross ratio thresholds C(60% and 50%) were determined for the single carrier bed in the inner and outer frontal deltas, and the connectivity probability increases with the increase of net-to-gross ratio. Affected by source supply and sedimentary evolution, the five sets of single carrier beds gradually become better from south to north and from bottom to top, and the oil and gas are mainly distributed horizontally in the favorable zone with a rapid net-to-gross growth of sandbody connectivity probability of 30%-50%.
Aiming at the problem of quantitative evaluation of static connectivity of delta front subfacies sandbodies in G Ⅲ-GⅣgroups in Qijia area of Songliao Basin, the core, logging and seismic data were used to quantitatively evaluate the static connectivity of sandbodies by using infiltration theory guidance and reservoir anatomy verification. The results show that the G Ⅲ-GⅣ groups are vertically divided into five sets of single sandstone carrier beds(S1-S5). Reservoir anatomy indicates that the proportion of oil-bearing sandstone in each single sandstone transport layer is gradually reduced from top to bottom due to the blockage of lake instrusive mudstone. Based on the differences in sedimentary environment, the initial connected net-to-gross threshold ratios C0(10% and 5%)and fully-connected net-to-gross ratio thresholds C(60% and 50%) were determined for the single carrier bed in the inner and outer frontal deltas, and the connectivity probability increases with the increase of net-to-gross ratio. Affected by source supply and sedimentary evolution, the five sets of single carrier beds gradually become better from south to north and from bottom to top, and the oil and gas are mainly distributed horizontally in the favorable zone with a rapid net-to-gross growth of sandbody connectivity probability of 30%-50%.
引文
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[3]MATTHEW J P,NICHOLAS K S.Static connectivty of fluvial sandstones in a lower coastal-plain setting:an example from the Upper Cretaceous lower Willianms Fork formation,Piceance basin,Colorado[J].AAPG Bulletin,2011,95(6):899-923.
[4]罗晓容,雷裕红,张立宽,等.油气运移输导层研究及量化表征方法[J].石油学报,2012,33(3):428-436.
[5]杨传超,张新涛,郭涛,等.源外斜坡区油气运移主控因素及优势路径刻画:以渤海海域石臼坨凸起斜坡区为例[J].断块油气田,2018,25(6):699-703.
[6]沈文洁,赵辉,刘伟,等.基于连通性方法的缝洞型油藏优势窜流通道识别[J].断块油气田,2018,25(4):459-463.
[7]施立志,王卓卓,张革,等.松辽盆地齐家地区致密油形成条件与分布规律[J].石油勘探与开发,2015,42(1):44-50.
[8]施立志,吴河勇,林铁锋,等.松辽盆地大庆长垣及其以西地区扶杨油层油气运移特征[J].石油学报,2007,28(6):173-187.
[9]王亚琳.油气沿断层走向运移的地质特征及相关问题探讨:以济阳坳陷沾化凹陷邵家断层为例[J].石油实验地质,2018,40(5):684-690.
[10]COLOMBERA L,NIGEL P,MOUNTNEY,et al.Models for guiding and ranking well-to-well correlations of channel bodies in fluvial reservoirs[J].AAPG Bulletin,2014,98(10):1943-1965.
[11]赵健,罗晓容,张宝收,等.塔中地区志留系柯坪塔格组砂岩输导层量化表征及有效性评价[J].石油学报,2011,32(6):949-958.
[12]田枭雄.齐家地区高台子油层3,4段储层综合评价研究[D].大庆:东北石油大学,2016.
[13]李振鹏,马存飞,刘春艳,等.地层视垂直厚度分析在油田小层对比中的应用[J].断块油气田,2018,25(5):626-630,634.
[14]庞正炼,陶士振,张琴,等.致密油二次运移和阻力实验研究:以四川盆地中部侏罗系为例[J].中国矿业大学学报,2016,45(4):754-764.