延长油气区中生界页岩气资源评价系统分析

Evaluation of Mesozioc shale gas resource in Yanchang oil and gas area

在延长油气区中生界长7陆相页岩气勘探认识的基础上,综合分析选取适合当前勘探程度的条件概率体积法计算页岩气地质资源量,其中通过有利区优选标准圈定含气面积922 km^2,页岩厚度与含气量相乘作为单一参数进行条件概率赋值,最终计算得到长7页岩气地质资源量2 456.26×10~8m^3。应用对比法和参数加权法对长7页岩气资源量可采系数进行估算,其中对比法估算为0.12,参数加权法估算为0.164。通过可靠度加权得到可采系数为0.151,结合评价出的地质资源量获得页岩气可采资源量368.44×10~8m^3。评价结果为延长油气区陆相页岩气的深入勘探开发提供了重要的指导作用,同时为其他地区页岩气资源量评价相关研究提供了技术借鉴。

Based on the understanding of the shale gas of Mesozioc Chang 7 in Yanchang oil and gas area, the conditional probability volume method was selected to evaluate the geological resource of shale gas. According to the screening criteria of favorable area, the gas bearing area of 922 km^2 was determined. And then the conditional probability was assigned by the product of shale thickness and gas content. The calculation results indicated that the geological resource of Chang 7 shale gas is 2 456.26 × 10^8 m^3. The recoverable coefficient was estimated by the contrasting method and the parameter weighting method corresponding to 0.12 and 0. 164. And then the final recoverable coefficient is 0. 151 by the reliable weighting, and the corresponding recoverable resource is 368.44 ~ 10^8 m^3. The evaluated result provides an important guiding role for further work of terrestrial shale gas in Yanchang oil and gas area and a technical reference for related research of the other area.