【摘要】 对储层非均质性强的小型复杂碳酸盐岩气藏,开发早期如何准确计算其储量是一个值得深入研究的问题,以经过近60年勘探开发的采出程度近50%的F气藏为例,在气藏地质特征分析的基础上,通过对不同勘探开发阶段的体积法、概率法和压降法计算的储量进行比较,分析了小型复杂碳酸盐岩储量计算的影响因素。结果表明,F气藏为礁后泻湖相沉积,储层呈薄层透镜状非均质体,属于裂缝—孔隙型带小油环的边底水气藏。根据11口钻井运用体积法计算的储量及概率法计算的储量偏大,不同阶段压降法计算的储量相差达5倍,其原因为将气藏储层均质对待,选取了不合理的有效厚度参数和不准确的孔隙度参数来计算储量造成了体积法储量偏大。短期试气储量动用范围小、气田累积产气量不准确等使压降法储量计算出现很大误差,而运用可靠的累积产气量和采出程度大于10%计算的压降储量比较可靠,可以作为气田的可动用储量。更多还原

【Abstract】 For small complex carbonate rock gas reservoir which has strong heterogeneity, how to compute the reserves precisely is an issue which is worth deeply researching. Taking carbonate rock gas reservoir which had been explored for nearly 60 years with the degree of reserve recovery nearly 50 % as an example, on the base of gas reservoir geological character analyses, the research on the influence factors of small complex carbonate rock reserves calculation was carried out by comparison of reserves respectively calculated by the volume method, the probability method and the pressure drop method in different exploration stages. The results showed that the gas reservoir F was back-reef facies with lagoon deposit while the reservoir was a thin-layered lenticular heterogeneous body, which belonged to the fracture-pore boundary bottom water with the small oil ring. The reserves calculated by the volume method and the probability method based on 11 drilling holes were slightly larger; the reserves calculated by pressure drop method of different stages varied by 5 times. Regarding the gas reserves as homogeneous body, choosing unreasonable effective thickness indexes and inaccurate porosity indexes were the causes of larger volume method reserves; short period producing range of gas test reserves was small and imprecise gas field accumulating production made pressure drop method big error occurred. However, the pressure drop reserves calculated by reliable accumulating gas production and degree of reserve recovery above 10 %could be used as available reserves of gas field.更多还原