Subaerial erosion occurs often with reduction to a peneplain . 陆上侵蚀常夷平成准平原。
2.
The - ray spectrometric survey of subaerial rocks in puziwan gold deposit and its geological significance 堡子湾金矿区基岩伽玛能谱测量结果及其地质意义
3.
The tree is an important subaerial object witch should be vividdly described and expressed in 3d gis . people have do some research about the tree model in 3d gis , but have n ' t got a perfect effect 树木是3dgis中对现实环境进行逼真的描述和表达的一个重要地物。在gis领域，人们已经做过一些有关树木模型的研究工作，但效果并不十分理想。
4.
The yanchang formation is divided , for the first time , into six third - order sequences , each with an average time duration of about 4 . 5 ma . the single sequence is composed of deltaic and lacustrine sandstones , siltstones and mudstones . the subaerial and subaqueous distributary channel and channel - mouth bar sandstone reservoirs are well developed mainly in the lowstand and highland systems tracts 论文在富县探区首次应用陆相层序地层学的观点和方法，把延长组划分为6个三级层序，平均时限4 . 5ma ，各层序由三角洲与湖泊相砂、泥岩沉积组成，主要在低位体系域和高位体系域发育水下(上)分流河道和河口砂坝砂岩储层
5.
The variations in trace element contents and ratios may hold up a mirror to the lake - level fluctuations and climatic changes , which , in turn , have exerted a direct and important effect on the sequence stratigraphic development . collectively , the reservoir rocks from the yanchang formation consist dominantly of the delta front subfacies subaqueous distributary channel and channel - mouth bar microfacies and delta plain subfacies subaerial distributary channel microfacies fine - grained feldspar sandstones and siltstones . the reservoir rocks have been subjected to three stages of diagenetic and porosity evolution : ( 1 ) the porosity reduction by the mechanical compaction and chemical pressure solution during the early diagenetic stage ; ( 2 ) the porosity increase by the dissolution during the a substage of the late diagenetic stage , and ( 3 ) the porosity reduction by the cementation and filling during the b substage of the late diagenetic stage 系统的储层特征研究表明，该区延长组储层成因类型主要为三角洲前缘水下分流河道、河口砂坝及三角洲平原水上分流河道微相细粒长石砂岩、粉砂岩；储层岩石经历了压实，胶结，溶蚀等成岩作用，历经早成岩机械压实和化学压溶孔隙缩小期、晚成岩a亚期溶蚀作用孔隙扩大期及晚成岩a亚期( b亚期)胶结充填孔隙缩小期三个成岩-孔隙演化阶段；储层物性总体上具有较低孔渗、低孔渗的特点，孔隙类型主要为粒间溶孔、残余粒间孔隙、粒内溶孔、晶间孔及晶间溶孔，裂缝不发育，储集岩排驱压力和中值压力较高，孔隙结构类型以细小孔-微孔隙，微细喉-微喉型为主。
6.
The rock types comprise the delta front subfacies subaqueous distributary channel , channel - mouth bar and distal bar microfacies , and delta plain subfacies subaerial distributary channel microfacies sandstones and siltstones . as for the reservoir quality , the subaqueous ( subaerial ) distributary microfacies channel sandstones are the first , the channel - mouth bar microfacies sandstones come second , the distal bar microfacies sandstones is the third , and the last one is the interdistributary bay microfacies sandstones . the intense compaction , pressure solution and late carbonate cementation are responsible for the reduction of the porosity and permeability of the reservoir rocks 三角洲前缘水下分流河道、河口砂坝、远砂坝及三角洲平原水上分流河道微相决定了储集岩的发育，分布及原始物性条件；水下(上)分流河道微相砂体厚度大、物性和孔隙结构好，次之为河口砂坝微相砂体，远砂坝微相砂体储集性较差，而分流伺湾微相砂体物性和孔隙结构最差。
