CAJ | 학술논문

鄂尔多斯盆地姬塬地区延长组长82沉积期，构造相对稳定，发育浅水三角洲沉积体系，湖岸线在东南部小规模迁移，分流河道及水下分流河道构成了该区沉积骨架。在对大量薄片和岩心分析的基础上，运用扫描电镜、X-衍射、阴极发光等实验手段，对长82储层的成岩作用进行了研究。研究结果表明，成岩作用对储层的影响具有双重性。早期绿泥石膜的发育对抵抗压实作用具有一定积极作用，早期方解石易与有机酸发生溶解反应，形成次生孔隙，改善储层物性，溶蚀作用极大程度地改造了储层物性，是次生孔隙形成的主要途径；压实作用破坏了成岩早期原生孔隙，晚期铁方解石堵塞孔隙，形成局部强钙质胶结区。沉积成岩作用对油气的分布具有决定性作用，分流河道及水下分流河道砂体厚度高值区决定了储层发育的形态及规模，在此基础上，受后期成岩作用改造的绿泥石胶结剩余粒间孔相和长石溶蚀＋剩余粒间孔相是该区油气聚集的重要场所。
악이다사분지희원지구연장조장82침적기，구조상대은정，발육천수삼각주침적체계，호안선재동남부소규모천이，분류하도급수하분류하도구성료해구침적골가。재대대량박편화암심분석적기출상，운용소묘전경、X-연사、음겁발광등실험수단，대장82저층적성암작용진행료연구。연구결과표명，성암작용대저층적영향구유쌍중성。조기록니석막적발육대저항압실작용구유일정적겁작용，조기방해석역여유궤산발생용해반응，형성차생공극，개선저층물성，용식작용겁대정도지개조료저층물성，시차생공극형성적주요도경；압실작용파배료성암조기원생공극，만기철방해석도새공극，형성국부강개질효결구。침적성암작용대유기적분포구유결정성작용，분류하도급수하분류하도사체후도고치구결정료저층발육적형태급규모，재차기출상，수후기성암작용개조적록니석효결잉여립간공상화장석용식＋잉여립간공상시해구유기취집적중요장소。
The structure of Jiyuan region in the Ordos Basin was relatively stable during the deposition of Chang 82 .In this period, a shallow water delta depositional system was developed , the lake shore line slightly migrated in the southeast ,and distributary channel and underwater distributary channel constituted the deposition framework .This paper studied the diagenesis of Chang 82 reservoir based on large amount of thin sections ,core observation,SEM samples,X-ray analysis ,and Cathodoluminescence analysis .The study shows that the diagenesis has double effects on the reservoir .On one hand ,early development of chlorite film has a positive effect on anti-compaction .The early calcite is easy to be dis-solved by organic acid , resulting in secondary pores and improving poroperm characteristics .Dissolution is the major mechanism of secondary pore formation and can greatly improve reservoir poroperm characteristics .On the other hand , compaction destroys the primary porosity formed in early digenetic process ,and late ferrocalcite fills pores ,resulting in lo-cal strong calcareous cementation zone .In general ,the sedimentary facies and diagenetic facies control the distribution of oil and gas .The former determines the reservoir shape and dimensions .While the later modifies reservoir pore space .Late diagenesis-modified chlorite-cemented sedimentary facies with residual inter-granular pores and that with feldspar-dissolu-tion plus residual inter-granular pores are the major reservoir spaces for hydrocarbon accumulation .