鄂尔多斯盆地中东部马五段碳酸盐岩气藏富气主控因素—以陕200井区为例

doi:10.13278/j.cnki.jjuese.201505104

摘要/Abstract

摘要：

靖边气田是中国最早发现的海相碳酸盐岩气藏之一,目前勘探范围仍在不断扩大。在回顾历年勘探和研究的基础上,以靖边气田陕200井区为例,总结和探讨了鄂尔多斯盆地中东部奥陶系碳酸盐岩储层富气的主控因素,以期为进一步勘探开发提供合理建议。研究表明:构造演变是靖边气田成藏的前提,决定了气田的分布范围和产气层位;沟槽的分布位置和切割深度对马五气藏的富集程度有着重要影响,鼻状构造不是主控因素。沉积环境是形成有利储层岩石类型的先决条件,潮间带云坪、潮上带膏云坪和含膏云坪微相是有利沉积微相。建设性的成岩作用是形成有利储集空间的重要保证,研究区多期溶蚀、白云化等建设性成岩作用对储层质量的改进较大,其中多期溶蚀作用是形成优质储集空间的主要成因。裂缝是天然气富集的重要因素,但裂缝发育程度因层位而不同。孔、洞、缝及沟槽的有效配置受构造、沉积、成岩作用的控制,每个层段的储集性能和天然气的富气程度不同。

关键词: 碳酸盐岩, 控制因素, 构造演变, 沉积环境, 成岩作用, 靖边气田

Abstract:

Jingbian gas field is one of the earliest marine carbonate gas reservoirs discovered in China, and its exploration area has been enlarging. Taking Well Shan 200 and its surrounding area as a study example, we discuss the main controlling factors of natural gas accumulation in Ordovician carbonate reservoir in the mid-eastern Ordos basin, and summarize the results as below: 1)The tectonic evolution of Jingbian gas field is the premise of gas accumulation. It determines the gas-field distribution range and the gas production layer. The location and cutting depth of the ancient valleys have a significant impact on the enrichment degree of Ma 5 gas reservoir. The nose structure is not the main controlling factor. 2)The sedimentary environment is a prerequisite for the formation of favorable reservoir rock. The favorable sedimentary microfacies are intertidal dolomite flat, supratidal dolomite flats, and gypsum-dolomite flats. 3)The constructive diagenesis with corrosion and dolomitization can improve reservoir quality; and multiple-phase corrosion diagenesis plays a role even more important. 4)Fracture is the important factor for natural gas enrichment, but the fracture development degree varies significantly from layer to layer. The efficient allocation of pore, cave, fracture, and ancient valley is controlled by tectonic structure,sedimentary, and diagenesis; therefore, the reservoir quality and gas enrichment of each gas layer segment are quite different.

Key words: carbonate, controlling factors, tectonic evolution, sedimentary environment, diagenesis, Jingbian gasfield

中图分类号:

P618.13

徐波, 唐铁柱, 李辰. 鄂尔多斯盆地中东部马五段碳酸盐岩气藏富气主控因素—以陕200井区为例[J]. 吉林大学学报(地球科学版), 2015, 45(5): 1299-1309.

Xu Bo, Tang Tiezhu, Li Chen. Main Controlling Factors of Natural Gas Accumulation in Carbonate in Fifth Member of Ordovician Majiagou Formation, Mid-Eastern Ordos Basin: Take Well Shaan 200 Area as a Study Example[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(5): 1299-1309.

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