致密砂岩气藏泥岩过剩压力与天然气富集

发布时间：2019-03-02 08:13

【摘要】：为研究泥岩过剩压力与天然气富集之间的关系,利用等效深度法计算了泥岩过剩压力,在此基础上开展了鄂尔多斯盆地上古生界致密砂岩气藏中泥岩过剩压力与气层空间分布关系分析。研究结果表明:鄂尔多斯盆地上古生界泥岩地层普遍存在欠压实,单井泥岩过剩压力曲线存在单峰型、多峰型和无峰型3种类型;石千峰组—山西组为一个完整的异常压力封存箱体系,最大泥岩过剩压力多出现在石千峰组—上石盒子组,阻止了烃类向上运移,气层主要发育在下石盒子组—山西组;压力封存箱的稳定性和连续性影响天然气富集程度,与盆地南部相比,北部和中部压力封存箱分布稳定,连续性较好,试气效果好,天然气富集程度较高。利用致密砂岩气藏泥岩过剩压力与天然气富集程度之间存在较强相关性这一研究成果,可为寻找有利目标区,进行下一步勘探开发提供一定程度的地质依据。
[Abstract]:In order to study the relationship between the excess pressure of mudstone and the enrichment of natural gas, the excess pressure of mudstone is calculated by the equivalent depth method. On this basis, the relationship between the excess pressure of mudstone and the spatial distribution of gas layer in the upper Paleozoic tight sandstone gas reservoir in Ordos Basin is analyzed. The results show that undercompaction is common in the upper Paleozoic mudstone strata of Ordos Basin. There are three types of single-well mudstone excess pressure curve: single-peak type, multi-peak type and no-peak type. Shiqianfeng formation-Shanxi formation is a complete abnormal pressure sealing box system. The maximum excess pressure of mudstone mostly occurs in Shiqianfeng formation-Shangshihezi formation, which prevents hydrocarbon migration upward, and the gas reservoir mainly develops in Xiashihezi-Shanxi formation. Compared with the southern part of the basin, the pressure storage tank in the north and middle of the basin has stable distribution, better continuity, better gas test effect and higher natural gas enrichment degree, and the stability and continuity of the pressure storage tank affect the natural gas enrichment degree in comparison with the southern part of the basin. Based on the strong correlation between the excess pressure of mudstone in tight sandstone gas reservoir and the enrichment degree of natural gas, a certain degree of geological basis can be provided for finding favorable target area and carrying on the next exploration and development.
【作者单位】：陕西延长石油(集团)有限责任公司;
【基金】：国家自然科学基金重大项目“非常规油气开发地球物理理论与方法研究”课题一“中国非常规油气储层特征、分类与典型地质模型建立”(41390451);国家自然科学基金面上项目“华北南缘与西缘早古生代等深流沉积特征类比及地质意义”(41172102)
【分类号】：TE311;TE37

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