徐家围子断陷沙河子组烃源岩预测方法  

PREDICTION METHOD OF SOURCE ROCKS IN SHAHEZI FORMATION OF XUJIAWEIZI RIFT

作　　者：于晶[1,2] 庞智英[2] 刘大锰[1] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2010年第2期18-22,共5页Petroleum Geology & Oilfield Development in Daqing

摘　　要：徐家围子断陷营城组火山岩和砾岩是深层天然气的主力储层，而气藏的形成受控于烃源岩的分布，下伏地层沙河子组的煤层和暗色泥岩是天然气形成的主力烃源岩，研究烃源岩预测方法，预测烃源岩分布范围是研究烃类气藏的基础。以往的烃源岩预测方法如沉积相法、类比法、井点法等，都是通过井间内插完成的预测，精度不够。由于暗色泥岩和煤层的发育与沉积环境有关，因此主要采用沉积相和波阻抗反演相结合的方法预测沙河子组暗色泥岩和煤层的分布。沙河子组暗色泥岩的西部边界为徐西断层，东部斜坡从南到北都有分布，具有南北走向的条带状分布特征，东西两翼薄中部厚，在断陷内凹陷最发育，厚度可达千米以上；沙河子组煤层主要沿断陷边缘分布。暗色泥岩发育有利于天然气的形成，紧邻煤层发育区气源充足。Volcanic rock and conglomerate in Yingcheng Formation are the main reservoirs of deep natural gas in Xujiaweizi Rift. The formation of gas reservoir is controlled by distribution of source rock. The underlying coal bed and dark shale of Shahezi Formation are the main hydrocarbon source rock where natural gas is generated. Research on the methods to predicate the distribution of hydrocarbon source rock is the basis for hydrocarbon gas reservoir study. The old prediction methods, such as sedimentary facies method, analogy method, well-point method, have low accuracy through interwell interpolate. As the development of dark shale and coal bed are related to the sedimentary environment, the methods of sedimentary facies and acoustic impedance inversion are mainly used to predict distribution of dark shale and coal bed in Shahezi Formation. The west boundary of dark shale in Shahezi Formation is Xuxi Fault, where east slope ate distributes from south to north, with the characteristics of striped northsouth distribution. The thickness of east and west wings is thinner than that of central area. Within the rift, sag is the most developed with thickness more than 1000 m. The coal bed of Shahezi Formation is mainly distributed along the edge of rift. Dark shale development is favorable for gas generation. Gas source is sufficient close to coal bed.

关 键 词：煤层 暗色泥岩 烃源岩 地震反演 沉积相 

分 类 号：TE121.32[石油与天然气工程—油气勘探]