塔北隆起三叠－侏罗系储集特征

CHARACTERS OF TRIASSIC-JURASSIC RESERVOIRS IN NORTHERN TARIM UPLIFT

塔北隆起三叠系储集层具有孔隙度由上往下逐渐变好、砂体由北往南增厚、储集性变好的特点；侏罗系储集层具有砂体北薄南厚，孔隙由北往南递增的特点。有粒间孔、粒内孔、填隙物微孔隙和缝隙四种孔隙类型，其中粒间孔占６０％～８０％，是最主要的孔隙。Ⅰ类储集岩Ｐｄ＜０．０１ＭＰａ，Ｄｍ＞５μｍ；Ⅱ类Ｐｄ０．１～２ＭＰａ，Ｄｍ２～５μｍ；匾类Ｐｄ０．２～５ＭＰａ，Ｄｍ＜２μｍ。从Ⅰ类到Ⅱ类，孔队结构由好变坏，毛细管压力由粗歪度变为细歪度，排驱压力和他和度中值压力由小变大、孔喉半径不断变小、储集性也不断下降。储层发育主要受埋藏深度和断裂及不整合面的控制。

The Triassic and Jurassic reservoirs in the northern uplift of Tarim Basin are mainly distributed in three exploring regions, i. e. Lunnan, Donghetang and Yingmaili.regions. The variation of the reservoiring spaces follow a certain .rule, and the reservoirs' quality is closely related to the pore structure. The reservoirs can be classfied into four grades according to theirphysical properties and capillary pressure. The main factors that control the reservoir properties are the buried depth, the development of faults and unconformity planes.