塔中地区南部台缘良里塔格组储层特征及形成机理

The Reservoir Characteristics and Genetic Mechanism of Lianglitage Formation in Southern Platform Margin of Tazhong Area

塔中南部台缘上奥陶统良里塔格组主要发育台缘滩和台缘礁储层,储层空间主要为粒内溶孔、铸模孔、粒间溶孔及沿缝合线溶蚀作用形成的扩溶缝和溶洞。通过岩心、测井、薄片及阴极发光分析,认为储层主要受沉积相、同生溶蚀作用、埋藏溶蚀作用及构造裂缝叠加控制。同生期大气水溶蚀作用是储层形成主要因素,主要受层序界面和高频层序控制。埋藏溶蚀作用主要由缝合线扩溶作用控制,构造裂缝改善了储层储集性能,为埋藏溶蚀作用及新孔隙系统的形成创造了有利条件。

The reservoir in Lianglitage lbrmation in southern of Tarim Basin during middle Ordovician period mainly contain plattbrm margin reef reservoir and platform margin breach reservoir, for which the primary reservoir spaces main- ly consist of intraparticle solution pores,moldic porosities,interparticle solution pores and the dissolved pores and the broaden dissolved fracture which formed by dissolution along the stylolite.Through the core and well logging,slice and cathode luminescent analysis,the reservoir is mainly affected by the sedimentary faces, syngenesis dissolution,burial disso- lution and structural fracture.The syndiagenesis dissolution is the primary lhctor of reservoir formation,which mainly con- trolled by sequence boundaries and high frequency sequences. Buried dissolution mainly controlled by the seam dissolu- tion.Structural fracture improved reservoir properties,which have created favorable conditions to the burial dissolution and new pore systems.