CAJ | 학술논문

延长组长8段是姬塬油田开发的主力油层,随着油气勘探开发程度的不断加深,其储层的平面非均质性已成为当前勘探开发的制约因素,因此对沉积相展布的精细描述显得非常重要。文中通过物源及相标志分析,认为延长组长8段受西北和东北2个方向物源的控制,经历了三角洲平原向三角洲前缘的过渡,沉积了纵向上叠置、横向上连片的分流河道砂体。在此基础上,对长81层不同亚相及不同物源控制下的砂体物性进行了对比,得出长81层三角洲平原的砂体物性比三角洲前缘的砂体物性好,受西北物源控制的砂体物性比受东北物源控制的砂体物性好。最后,对长8段有利储集相带进行了预测,认为姬塬油田西北方向的储集物性较好,具有较大的油气勘探潜力。
연장조장8단시희원유전개발적주력유층,수착유기감탐개발정도적불단가심,기저층적평면비균질성이성위당전감탐개발적제약인소,인차대침적상전포적정세묘술현득비상중요。문중통과물원급상표지분석,인위연장조장8단수서북화동북2개방향물원적공제,경력료삼각주평원향삼각주전연적과도,침적료종향상첩치、횡향상련편적분류하도사체。재차기출상,대장81층불동아상급불동물원공제하적사체물성진행료대비,득출장81층삼각주평원적사체물성비삼각주전연적사체물성호,수서북물원공제적사체물성비수동북물원공제적사체물성호。최후,대장8단유리저집상대진행료예측,인위희원유전서북방향적저집물성교호,구유교대적유기감탐잠력。
Chang 8 member of Yanchang Formation is the major reservoir in Jiyuan Oilfield.With the development of oil and gas exploration,the areal heterogeneity of the reservoir has become an obstacle for further exploration and development,so the fine sedimentary facies description is particularly significant.Based on the analysis of sediment provenance and facies indicator,it is considered that Chang 8 member of Yanchang Formation is controlled by the provenances from the northwest and northeast,experienced the transformation from delta plain to delta front,and deposited distributary channel sand body which is superimposed vertically and continuous laterally.The physical properties of Chang 81 layer under different subfacies and different sources are contrasted.The result shows that the reservoir property of delta plain in Chang 81 layer is better than that of delta front,and the reservoir property controlled by the provenance from northwest is better than that controlled by the provenance from the northeast.The favorable reservoirs of Chang 8 member are predicted,and it is considered that the reservoir in the northwest of Jiyuan Oilfield has great hydrocarbon potential.