CAJ | 학술논문

志留系柯坪塔格组海相砂岩是英买力地区的主要储层和产层.英买力34、35两个井区的储层岩性、沉积环境均十分相似,而储层物性相差很大.通过储层岩石学、孔隙类型和孔隙结构、储层物性、成岩作用等多种特征综合研究,认为英买34、35区储层同为无障壁滨浅海沉积石英砂岩.英买34井区储层物性较好,属于中孔、中渗储层;英买35井区储层基质物性很差,属于特低孔、特低渗储层,但是张性微细裂缝发育,属于孔隙-裂缝复合型储层.试油结果表明两个区均具有较高产能且比较稳定.在充分认识两个区储层特征的基础上,笔者认为英买34、35井区储层性质的差异是后生成岩作用和构造作用造成的.
지류계가평탑격조해상사암시영매력지구적주요저층화산층.영매력34、35량개정구적저층암성、침적배경균십분상사,이저층물성상차흔대.통과저층암석학、공극류형화공극결구、저층물성、성암작용등다충특정종합연구,인위영매34、35구저층동위무장벽빈천해침적석영사암.영매34정구저층물성교호,속우중공、중삼저층;영매35정구저층기질물성흔차,속우특저공、특저삼저층,단시장성미세렬봉발육,속우공극-렬봉복합형저층.시유결과표명량개구균구유교고산능차비교은정.재충분인식량개구저층특정적기출상,필자인위영매34、35정구저층성질적차이시후생성암작용화구조작용조성적.
Silurian seashore sandstone is the main oil reservoir and oil-producing formation in YM34 and YM35 well blocks.The lithology and depositional setting of these two well blocks are very similar to each other,but their reservoir properties are different significantly.According to such characteristics of these two blocks as lithology,porous styles,porous architectures,physical properties and diagenesis,the reservoirs of both YM34 and 35 well blocks are composed of seashore silicarenite in no-barrier shoreland.The YM34 well block is of moderate porosity and permeability,while the YM35 well block is of extremely low porosity and permeability,with the reservoir matrix properties of the former better than those of the latter.Nevertheless,the open fractures are developed significantly in the YM35 well block,suggesting a porous fractured complex reservoir.Well test shows that both the well blocks are of high and stable deliverability.Based on the full understanding of the reservoir properties,this paper has reached the conclusion that diagenesis and tectonic activity are the main factors responsible for the differences of reservoir properties between the YM34 well block and the YM35 well block.