鄂尔多斯盆地召38区块储层建构模式及其控制作用

Reservoir architectural model and its control role in Block Zhao 38 of Ordos Basin

储层建筑结构要素分析法是河流相储层研究的有效方法。在召38区块运用Miall分析法确定了1～6级储层建筑结构要素：层系、层系组、大型砂体增生、单个河道和心滩、河道复合体、河道复合体群。识别4级建筑结构要素4类：心滩砂、河道砂、溢岸砂、泛滥泥。召38区块储层建筑结构要素分布模式为：1）平面上，根据河道砂和泛滥泥发育程度分3类．即交织状模式、交织一条带状模式、条带状模式；2）剖面上，根据河道砂、心滩砂等建筑结构在垂向叠置和侧向连续特征分2种，即迷宫式结构、拼合式结构。召38区块建筑结构的发育受气候条件和基准面旋回的双重控制，而建筑结构控制着有效砂体的发育。

Reservoir architectural elements analysis is an effective way to study fluvial reservoirs. In Block Zhao 38, the reservoir architectural elements are divided into six levels such as set, coset, large aggradational sand body, single channel fill sand body and channel bar, channel complex and channel complex groups. Four types and levels of architectural elements are identified such as channel bar sand body, channel fill sand body, overbank sand body and flooding mud. The distribution patterns of architectural elements in Block Zhao 38 arc as follows： based on channel sand and inter-channel mud development, braided, braid-banded and banded patterns are divided; based on the channel sands in the vertieal and lateral continuous features, Laby-rinth and jigsaw-puzzle structures are divided. Development of sand bodies in Block Zhao 38 is affected by climate conditions anti datum horizon cycles and the development of effective sand bodies is controlled by arehiteetural structure.