CAJ | 학술논문

针对东濮凹陷胡状集油田胡12块严重非均质油藏,采用室内实验对注水前后实际岩心样品进行对比分析,研究了注水开发过程中的流体动力地质作用.结果表明,酸性介质条件的化学动力作用加速了碎屑组分中的长石类矿物尤其是斜长石的溶蚀,同时生成了新的高岭石晶体并分布于细小孔喉,但对碳酸盐类矿物的影响较小.注水冲刷等物理动力地质作用造成了储集层泥质矿物总量的降低和粉砂—极细砂级石英颗粒的缺失,且主要发生在物性较好且优势渗流通道较发育的层段.在储集层孔喉变化方面,注水开发既使相对较大孔喉增加,改善了储集层的渗滤条件,也使孔喉分选程度降低,加剧了储集层微观非均质性.从储集层孔隙度、渗透率等宏观参数变化看,注水开发致使储集层总体平均有效孔隙度降低4.63%,而总体平均有效渗透率上升8.93%,原始物性不同的储集层注水后物性变化呈现出明显的“马太效应”.图7表3参15
침대동복요함호상집유전호12괴엄중비균질유장,채용실내실험대주수전후실제암심양품진행대비분석,연구료주수개발과정중적류체동력지질작용.결과표명,산성개질조건적화학동력작용가속료쇄설조분중적장석류광물우기시사장석적용식,동시생성료신적고령석정체병분포우세소공후,단대탄산염류광물적영향교소.주수충쇄등물리동력지질작용조성료저집층니질광물총량적강저화분사—겁세사급석영과립적결실,차주요발생재물성교호차우세삼류통도교발육적층단.재저집층공후변화방면,주수개발기사상대교대공후증가,개선료저집층적삼려조건,야사공후분선정도강저,가극료저집층미관비균질성.종저집층공극도、삼투솔등굉관삼수변화간,주수개발치사저집층총체평균유효공극도강저4.63%,이총체평균유효삼투솔상승8.93%,원시물성불동적저집층주수후물성변화정현출명현적“마태효응”.도7표3삼15
Hu12 Block of the Huzhuangji Oilfield is a typical strongly heterogeneous reservoir. The hydrodynamic geology effect was studied by comparing experimental results of cores before and after waterflooding. The experimental results show that the chemical force of acidic medium accelerates the dissolution of plagioclase, generating new kaolinite crystals in small pore throats at the same time. The chemical force has less impact on carbonate minerals. The physical force of the injected water caused the reduction of the total content of argillaceous minerals and the loss of quartz grains of silt to very fine sizes, which occurred in layers with good physical properties and developed channeling paths. In terms of changes in pore-throats, waterflooding resulted in the increase of the large pore-throats and improvement of percolation conditions, also gives rise to the reduction of pore throat sorting and the aggravation of micro-heterogeneity of reservoir. With respect to variations in reservoir macroscopic parameters, waterflooding leads to the drop of overall average effective porosity by 4.63% and the rise of overall average effective permeability by 8.93%. The physical property changes of reservoirs of different original properties take on obvious“Matthew Effect”.