浅水三角洲分流河道砂体储层特征

EESERVOIR CHARACTERISTICS OF DISTRIBUTARY CHANNEL SAND BODIES OF SHALLOW WATER DELTA

浅水三角洲分流河道砂体是一类独特的重要储层类型，其主要特征有：（１）砂体垂向层序类型多样，砂体厚度变化大；（２）砂层级规模上砂体及物性的展布为条带状或豆类状形态；（３）单砂体在空间上的分布具有随机性，主要受古地形、古构造及占水流势能等因表素控制；（４）分流河道砂体为典型的迷宫式储层地质模型，可分为等厚式、不等厚式、极端不等厚式三种模型；（５）开发这类储层的油藏有一定难度，井网布置要合理。

The distributary channel sand bodies in shallow water delta are one type of particularand irnportant reservoir rock.They are characterized by the following aspects:(1)Vertical se-quence types varied and thickness of sand bodies changed a lot.(2 ) Sandstone thickness,porosity and permeability of a reservoir are distributed in a shape of belt or beanpod in sandmernber scale. (3)Sand bodies are occured randomly is space, which are controlled by pale-ogrogeaphy,tectonic structure and energy of flow. (4)Distributarv channel sand bodies com-pose labyrinth reservoir geological models,which may divided into equal thickness and very unequal thickness reservoir geological models.(5)It is rather difficult to develop this kind ofreservoir,well pattern locations must be reasonable.