苏里格气田59区盒8段地震储层预测及烃类检测技术研究

发布时间：2018-03-08 01:31

  本文选题：致密砂岩储层预测　切入点：地震属性　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：致密砂岩气储量丰富,产量高,是非常规气勘探和开发取得效益的显著增长点,它的研究和勘探开发将对未来天然气工业的发展意义重大。苏里格气田已成为全国储量最大且年产气量最高的第一大气田,它在致密砂岩气研究中起举足轻重的作用。59区位于苏里格气田西区,鄂尔多斯盆地中北部,构造较简单,为宽缓的西倾单斜。盒8段致密气藏属于地层岩性圈闭气藏,主要为辫状河沉积,储集层展布较广,但单砂体厚度相对小,横向变化较快,纵向分布层次多,薄互层发育,气水关系复杂,地震资料主频偏低,频带宽度较窄,致使储层预测具有较大的困难。 本文以苏里格气田盒8段致密砂岩储层为研究对象,结合该区地震、测井、地质、钻井、录井等信息,采用三种方法进行储层综合预测。首先在统计过井储层地震响应模式的基础上,沿层提取刻画河道砂体的叠后敏感属性；其次使用波阻抗反演预测砂体的展布；结合AVO正演模拟,采用截距梯度交会解释方法进一步对研究区含气砂体的分布进行描述。最后综合上述地震技术得到苏里格59区盒8段地震储层综合平面预测结果,有效提高了预测的精度,取得了较好的效果。研究主要取得了以下成果： ①叠后资料过井剖面地震响应模式统计分析表明,盒8下储层为两峰夹一谷形态,I类和II类井具有强波谷特征,III类井及水井为中波谷。由此利用该特点,沿地震层位提取了地震敏感属性,而后对敏感属性进行主成分分析,客观形象的描述了盒8段河道砂体的展布。 ②约束稀疏脉冲反演不依赖于初始模型,忠实于地震数据,储层阻抗响应模式为：盒83～盒84段内阻抗值为9150-10500g/cm3*m/s的低阻抗异常。 ③AVO厚层模型正演表明：盖层条件会影响AVO类型,上覆高阻抗盖层是研究区内产生Ⅳ类AVO的主要因素；含气饱和度和盖层条件固定时,截距越小储层孔隙度越大；盖层条件固定,孔隙度较小时梯度绝对值越大,含气饱和度越高,当孔隙度较大时,梯度绝对值越小,截距绝对值越大含气饱和度越高。 ④薄互层AVO数值模拟分析表明声学介质条件下会出现假亮点,在弹性介质中进行数值模拟更为合理。 ⑤在厚层及薄互层AVO正演模拟的指导下,P-G交会属性能较为准确的将III类和Ⅳ类有利区域结合起来,有效的预测出含气砂岩发育带,预测结果与井的吻合度较高,且能一定程度的区分气井、水井及干井。 本次研究融合地质、钻、测井、地震等多种信息,综合运用属性分析、反演及AVO技术,总结出一套切实可行的致密砂岩储层综合预测方法,为下一步井位部署和勘探开发提供参考。
[Abstract]:Dense sandstone gas is rich in reserves and high in production. It is a significant growth point for the benefit of unconventional gas exploration and development. Its research and exploration and development will be of great significance to the development of the natural gas industry in the future. Sulige gas field has become the largest gas field with the largest reserves and the highest annual gas production in the country. It plays an important role in the study of tight sandstone gas. Area 59 is located in the western part of Sulige gas field and in the central and northern part of Ordos basin. The reservoir is mainly braided river deposit, but the single sand body thickness is relatively small, the lateral change is faster, the longitudinal distribution level is many, thin interbed is developed, the gas-water relationship is complex, the main frequency of seismic data is low, and the band width is narrow. As a result, reservoir prediction is difficult. In this paper, the tight sandstone reservoir of Ke 8 member of Sulige gas field is taken as the research object, and the seismic, logging, geological, drilling, logging and other information in the area are combined. Three methods are used for comprehensive reservoir prediction. Firstly, the poststack sensitive attributes of channel sand bodies are extracted along the formation on the basis of statistical seismic response models of well-crossing reservoirs, and the distribution of sand bodies is predicted by wave impedance inversion. Combined with AVO forward modeling, the distribution of gas-bearing sand bodies in the study area is further described by means of intercept gradient intersection interpretation method. Finally, the comprehensive plane prediction results of seismic reservoir in Box 8 member of Sulige 59 area are obtained by synthesizing the above seismic techniques. The prediction accuracy is improved effectively and good results are obtained. The main results of the research are as follows:. (1) the statistical analysis of seismic response patterns in the cross-well profile of post-stack data shows that the reservoir below Box 8 has two peaks and one valley type I and type II wells with strong wave valley characteristics and well type III and wells as middle wave troughs. The seismic sensitive attributes are extracted along the seismic horizon, and then the principal component analysis of the sensitive attributes is carried out. The distribution of channel sand bodies in section 8 of the box is described objectively. 2 the constrained sparse pulse inversion is independent of the initial model and faithful to the seismic data. The reservoir impedance response model is the low impedance anomaly with the impedance value of 9150-10500g / cm ~ 3m / s in the 83-box 84 section. 3The forward modeling of AVO thick layer model shows that the caprock condition will affect the AVO type, the overlying high impedance capping is the main factor to produce type 鈪，

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