生物礁滩岩性气藏含气面积的圈定方法——以元坝气田长兴组气藏为例

开展生物礁滩气藏的储层空间展布特征研究,对于该类型气藏的储量计算和高效开发有着重要意义.由于元坝地区长兴组生物礁滩体埋深超过6 000 m,具有横向变化大和非均质性强的特点,简单的储层预测技术方法难以达到定量研究储层空间展布的要求.在沉积相研究的基础上,开展高精度相控储层定量预测,通过相控储层预测技术的应用,精细刻画了生物礁滩的空间展布特征和边界.评价井成功率达到100%,有效储层厚度20～70m.目前已探明长兴组气藏含气面积155.33km2,探明天然气地质储量1 592.53×108m3. 

Delineation of gas-bearing area of lithologic gas reservoir in organic beach reef:A case study in Changxing Formation,Yuanba Gas Field

The delineation of reservoir distribution in organic beach reef is significant for reserve estimation and exploitation.In Yuanba area,the organic beach reef in the Changxing Formation is buried over 6 000 m deep,and is featured by lateral deformation and strong heterogeneity.It is difficult to delineate reservoir distribution quantitatively by simple forecasting method.Based on sedimentary facies,the quantitative forecast of phase-controlled reservoir has been carried out with high accuracy.It describes the distribution feature and limit of organic beach reef.The returned ratio of evaluation wells is 100% and the available reservoir thickness is 20-70 m.The gas-bearing area in the Changxing Formation is 155.33 km2,and the gas-in-place is about 1 592.53×108 m3.