辽河西部凹陷储层成岩作用及有利储层预测

DIAGENESIS OF RESERVOIRS AND PREDICTING HIGH-QUALITY RESERVOIRS IN THE LIAOHE WESTERN DEPRESSION

通过成岩作用研究与储层综合评价技术,预测辽河西部凹陷南区沙河街组有利储层的平面展布。通过对薄片的鉴定,确定本区砂岩主要类型;利用普通薄片、铸体薄片、扫描电镜、阴极发光等手段研究不同地区、不同层位、不同沉积环境的成岩作用;同时确定主要孔隙类型;以及依据有机质成熟度有关指标等成岩序列和成岩阶段划分标志,进行成岩作用的研究结果表明,划分成岩阶段;通过217口井的薄片资料、沉积相分布和油气分布区图例的分析,确定本区成岩相主要类型;依据岩心测试、测井解释成果,以及孔隙度—深度关系图,发现纵向上储层发育3个主要次生孔隙发育带;通过对储层次生孔隙带形成的主控因素分析得知,通过建立储集物性与沉积相关系、建立成岩作用与储集特征的关系、构造活动与储层发育之间的关系,结合沉积相图、成岩相图、各井储层物性综合评价图,平面上圈定出有利储层、较有利储层发育区。

In the interest of predicting the high porosity zone occurrences in the Liaohe western depression, uheriorly enriching and perfecting the exploration technology of sandstone and conglomerate in the reservoir, firstly we studied all kinds of diageneses in this region, divided diagenetic stages, and then analyzed the diagenesis of high porosity zone formation, finally predicted high porosity zone occurrences in the horizontal orientation. We attempt to predict the areas favorable reservoirs developed in the horizontal orientation of Liaohe western de- pression, then enrich and perfect the exploration technology of sandstone and conglomerate in the reservoir uheriorly by studies on diagenesis and evaluating methods of oil and gas reservoirs. The methods of the studies involve stratigraphic analysis and cores samples analysis.Thin-section observation and scanning electron microscope（SEM） have been applied to study the main principle problem. As the results of the diagenesis researches show, the Tertiary reservoirs composed of clastic rock in the Liaohe western depression can be divided into three stages.It can be divided dominantly into four diagenetic facies, the early compaction and cementation, dissolution and partial recementation, strong compaction diagenetic facies. Three high porosity zones are developed in the vertical orientation. According to the evaluating methods of oil and gas reservoirs in Petro China,the reservoirs of the Shahejie Formation are divided into 4 types. The areas developed favorable and the relatively favorable reservoirs are blocked out by superposing the diagenetic facies map on the microfacies map. It＇s suggested that we should seek the traps and do further explorations and researches in the areas.