致密碎屑岩储层物性影响因素及优质储层主控因素——以松辽盆地长岭断陷龙凤山次凹营城组为例

以松辽盆地长岭断陷龙凤山次凹营城组致密碎屑岩储层为研究对象，应用多种技术及手段对物性影响因素及优质储层主控因素进行研究。致密碎屑岩的储层物性影响因素包括岩石类型、沉积微相、砂泥界面、胶结作用、溶蚀作用及微裂缝。利于致密气储集的因素为：①孔隙衬里绿泥石、②火山岩岩屑溶蚀、③微裂缝。其中：①孔隙衬里绿泥石可通过减缓压实和抑制胶结作用来保护原生孔隙，进而控制水体环境转化带的储层质量；②火山岩岩屑溶孔是主要的次生孔隙类型，可控制酸性流体分布区的储层质量；③生烃增压成因的微裂缝能够增加储层的渗透性，进而控制深水沉积区的储层质量。主控因素①主要分布于盆地边缘的浅水区，主控因素③主要分布于盆地近中心的深水区，主控因素②全区分布。主控因素②可与①或③叠加共同控制优质储层的分布，基于此建立优质储层平面分布模式，预测有利区并获得了生产验证。

Influencing factors of tight clastic reservoir physical properties and main controlling factors of high-quality reservoirs：Taking the Yingcheng Formation of Longfengshan sub-sag in Changling Fault Depression of Songliao Basin as an example

Taking the tight clastic reservoirs of the Yingcheng Formation in the Longfengshan sub-sag of the Changling Fault Depression in the Songliao Basin as the research object， a variety of techniques and methods are used to study the physical properties and main controlling factors of high-quality reservoirs. The influencing factors of reservoir physical properties of tight clastic rocks include rock type， sedimentary microfacies， sand-mud interface， cementation， dissolution and microfractures. The factors conducive for the accumulation of tight gas are chlorite in the poor lining， dissolution of volcanic rock debris and microcracks. Among them： （1） The pore lining chlorite can protect the primary pores by slowing down compaction and inhibiting cementation， thereby controlling the reservoir quality of the water environment transformation zone； （2） The dissolved pores of volcanic rock debris are the main type of secondary pores， which can control the quality of the reservoir in the acid fluid distribution area； （1） Microfractures caused by hydrocarbon-generating pressurization can increase the permeability of reservoirs， thereby controlling the quality of reservoirs in deep-water depositional areas. The main controlling factor（1） is mainly distributed in the shallow water area at the edge of the basin， the main controlling factor（3） is mainly distributed in the deep water area near the center of the basin， and the main controlling factor（3） is distributed in the whole area. The main controlling factor（2） can be superimposed with （1） or （3） to control the distribution of high-quality reservoirs， and based on this， a plane distribution model of high-quality reservoirs can be established to predict favorable areas and obtain production verification.