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Sahul向斜区主要含油气层是Elang组砂岩,钻探结果表明南北部储层物性存在很大差异,而储层物性是目前制约该区油气勘探的主要因素之一。文中从沉积环境和成岩作用两个方面探讨了影响Elang组储层物性的因素。向斜区南北部Elang组虽发育相同的三角洲前缘分流河道和砂坝,但由于沉积时古地形不同,南北部砂体受水动力改造程度不同,因而北部砂岩泥质含量较低、物性较好,而南部砂岩泥质含量相对较高、物性稍差。受古地貌、古地温和晚期构造活动的多重影响,向斜区南北部Elang组砂岩所处成岩阶段不同,成岩作用程度的差别加大了南北部Elang组储层物性的差异性。
The main hydrocarbon reservoir in the Sahul syncline area is Elang sandstone. The drilling results show that the physical properties of the reservoirs in the north and south are quite different. The reservoir physical properties are one of the main factors restricting oil and gas exploration in this area. In this paper, the factors influencing the reservoir physical properties of Elang Formation are discussed from sedimentary environment and diagenesis. Although the same delta front distributary channel and sand bar are developed in the north and south part of the syncline, the sand bodies in the north and south are different due to the different paleogeomorphology during sedimentation. Therefore, Well, while the southern sandstone shale content is relatively high, somewhat less physical. Due to the multiple effects of paleogeomorphology and tectonic activity of the late Paleogene, the difference of diagenesis between the Elang Formation sandstone in the north and south of the syncline and the diagenesis of the Elang formation in the north and south of the syncline area increases the difference of reservoir physical properties in the Elang Formation in the north and south.