SEDIMENTARY SYSTEMS OF SUDONG BLOCK SHANXI FORMATION IN SULIGE GAS FIELD
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摘要: 利用岩心、测井、地震、岩石薄片、分析化验等资料,对鄂尔多斯盆地苏里格气田苏东区块山西组山1、山2段沉积微相进行了研究。研究结果表明,苏东气田东北地区山西组山1、山2段发育了洪泛曲流河沉积体系,主要沉积微相有曲流河道、边滩、河漫滩、河道间等微相类型。在沉积环境分析的基础上,进一步研究了区内沉积微相的平面展布特征及其演化规律,认为区内山2沉积期:发育曲流流河道砂体,储层以褐色含砾中粗粒岩屑石英砂岩-细砾岩为主,并且沉积期为近物源区的冲积平原河流相沉积,受潮湿气候及弱水动力沉积环境的影响,大面积发育河漫沼泽沉积,为煤层提供了温床,纵向上形成了3~5套煤层,物源供给相对充沛,形成了一定厚度的曲流河道块状砂体沉积;山西组山1沉积期:受潮湿气候的影响,广泛发育湿地河漫湖泊、河漫滩沉积。Abstract: Cores, logs, seismic profiles, rock flakes, laboratory data and other information were studied for the microfacies of the Shan1&Shan2 Formation in Sulige Gas Field, SuDong Block. Results show that the gas fields in northeast Shan1&Shan2 Formation occur in a meandering river and floodplain depositional system. The main sedimentary facies include the microfacies of meandering rivers, point bars, floodplains, interdistributary bays. The regional microfacies distribution characteristics and its evolution,and gets to the result that the meandering riverway body sand reservoirs Develops on the coarse brown pebbly lithic grains of quartz sandstone-thin conglomerate based in the depositional phase of Shan2 formation. Depositional system is near the source area of the alluvial plain of fluvial sediment, by the humid climate and the Weak water sedimentary environment of dynamic, develops large-scale river swamps diffuse deposition for the Coal layer provides a breeding ground, and formations the 3-5 sets of longitudinal seam. Source supply is relatively abundant, and formations a certain thickness of massive sand meandering channel deposits. In Shan1 deposition period:by the humid climate, well developed wetland Man River lakes, floodplain deposition.
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Key words:
- Sulige Gas Field /
- Shanxi Group /
- Sedimentary Microfacies /
- Meandering River
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