楚雄盆地北部上三叠统储集体构型及空间分布

The Architecture and Distribution of the Upper Triassic Reservoir of the Northern Chuxiong Basin

通过实测野外露头,沉积层序与高分辨层序地层学相结合,采用扩展Simpon方法,扩展Simpon3/8方法及Trapezoidal方法,研究储集体构型及空间展布。上三叠统储集体为砂砾岩,总体上表现为自下而上逐渐减薄。普家村期(T3p),北部太平场和南部洒芷两个扇储集体互不连通,自成体系。南部扇连通较好,是有希望目的层。干海子期(T3g)时的河控三角洲砂体与浪控三角洲砂体的连通性和非均质程度差别颇大。舍资期(T3s)时砂体呈环状分布。湖成砂体连通性差,河道砂体则均质性高,连通较好。

The Triassic： reservoir sandstone was from the basin-floor fan to the coastal bar and the delta, and can be divided into eight third-order sequences in the Chuxiong basin during late Triassic. This paper, using depesitional sequence stratigraphy and high-resolution sequence stratigraphy, using extended Simpon math, extended Simpen 3/8 math and Trapezoidal math, has studied the reservoir architecture and spatial distribution through measured sections. The reservoir-body of upper Triassic, showing successive thin from lower to upper, was sandstone and conglomerate. The southern and northern fan-bodies of the Pujiacun formation （T3p） that was 7162 km^3had not become connection. Although the northern sandstone and conglomerate has worse connection, shorter extension and more extensive heterogeneity, the southern channel sandstone bodies have been larger and better connection. The sandstone and conglomerate of the Ganhaizi formation （T3s）, which was 4175 km^3 ,was oval distribution, more barrier layers and extensive heterogeneity in the north, and was circling distribution, weaker maro-heterogeneity in the south. The circling sandstone body of the Shezi Formation （ T3s） was 5036 km^3, in which the connection of the lake sandstone body was worse than that of the channel sandstone body and the latter was been characterized by more homogeneous.