松辽盆地北部深层碎屑岩浊沸石成因、演化及与油气关系研究

浊沸石作为松辽盆地深层最重要的一种成岩自生矿物，分布广泛，后期受成岩改造强烈，形成了高产的次生孔隙气藏。通过X射线衍射分析、X射线粉晶分析、红外光谱分析和显微热台等分析，确定了松辽盆地深层碎屑岩内浊沸石含量及矿物学特征，探讨了浊沸石的成因；利用扫描电镜和图像分析仪系统研究了浊沸石溶孔特征和深层有机酸与浊沸石次生孔隙的成因关系，指出浊沸石溶孔在纵向上呈发育到较发育到不发育的旋回性变化，溶孔发育段厚度一般2～3m，平面上升平-汪家屯和昌德地区浊沸石溶孔可能连片；浊沸石次生孔隙形成期与天然气主运聚期具较好的匹配关系，并使被浊沸石胶结的砂岩表现出双重性：早期封盖，晚期储集．表明次生孔隙发育带最有可能成为高产油气层。

Formation and Evolution of Laumontite and Relationship between Oil and Gas in the Clastic Rock of the Deep Strata of the North Songliao Basin

Songliao basin is a high geotemperature field, the violent cementation in the deep strata made the primary pores decrease quickly, and only the secondary pores can make clastic rock have storage capacity. As the most important authigenic mineral in the deep strata of Songliao basin, Laumontite was distributed widely and regenerated by later diageneses, so that high-yield gas reservoir of the secondary pores were formed. In the paper, by applying for polarization microscope, X-ray diffraction analysis, infrared spectroscopy method and temperature heating (measu)rements, the content and mineral characteristic of laumontite in the clastic rock of Songliao basin are determined, its formation process is discussed.By applying the scanning electron microscope and image analysis, the dissolution porosity in the laumontite and the relationship with organic acid are thoroughly studied. Furthermore, the distribution of laumontite dissolution porosity are pointed out that in vertical laumontite dissolution porosity alternated from fairly well developed to undeveloped. The thickness of dissolution porosity strata was about 2-3 meters. In horizontal laumontite dissolution porosity is quite well developed in Shengping-Wangjiatun and Changde area. The period of the secondary pore formation closely matched that of natural gas migration. The sandstone cemented by laumontite has dualism: cover earlier and storage later. There is a probability that the secondary pore zone is a high-yield hydrocarbon reservoir.