麦盖提斜坡北新1井吐依洛克组角砾岩储层特征

Characteristics of breccia reservoir of Tuylock Formation of well Beixin-1 in Markit Slope of Tarim Basin

塔里木盆地麦盖提斜坡北新1井首次在古近系阿尔塔什组膏盐岩之下揭示了一套吐依洛克组白云质角砾岩和白云岩储层,并且获得油气发现。为明确储层发育特征,利用测试产层段连续取心获得的实物资料,开展储层物性、储集空间、成岩作用及成因研究。结果表明:白云质角砾岩储层具有良好的储层物性;裂缝和溶蚀孔洞主要分布在角砾状粉晶云岩与粉晶云岩段,是其主要的储集空间。准同生期和成岩早期的膏溶作用和喜山期的构造破裂作用是主要的建设性成岩作用。白云质角砾岩的原始沉积环境为局限潮坪或泻湖相,准同生期发生普遍的膏溶作用和喜山期遭受构造破裂作用是白云质角砾岩储层的两大建设性作用。

A set of dolomite and dolomitic breccia reservoir covered by the gypsum bed of Aertashi Formation was firstly drilled in well Beixin-1 in Markit Slope of Tarim Basin,which obtained oil and gas discovery.In order to define reservoir characteristics,studies on reservoir physical properties,reservoir space,diagenesis and genesis were carried out by using the data obtained from continuous coring of the test production section.The results show that the dolomitic breccia reservoir has good reservoir physical properties,and fractures,dissolved pores and cavities are the main types of reservoir space,which mainly distributed in the brecciated silty dolomites and silty dolomites.The gypsum dissolution in the para-syngenetic period and early diagenetic stage and the tectonic rupture in Himalayan tectonic movement are the mainly constructive diagenesis.The original sedimentary environment of dolomitic breccia was limited tidal flat or lagoon,and the reservoir was developed by gypsum dissolution,and reformed by tectonic rupture during the Himalayan period.