四川盆地元坝地区下侏罗统介壳灰岩储层分布预测

摘要/Abstract

摘要：

四川盆地下侏罗统自流井组大安寨段一亚段(大一亚段)灰岩是元坝地区主要产气层。岩心、薄片、物性资料、试油、录井、测井、地震资料综合研究表明,大一亚段灰岩主要为介壳灰岩和含泥介壳灰岩,介壳灰岩平均孔隙度2.36%,平均渗透率为0.02×10^-3 μm²,含泥介壳灰岩平均孔隙度为4.59%,平均渗透率为0.21×10^-3 μm²。介壳灰岩为浅湖亚相高能滩微相沉积,含泥介壳灰岩为浅湖亚相次高能滩微相沉积。地震波形分类上,以介壳灰岩为主的高能滩微相为高连续低频中强波谷反射,以含泥介壳灰岩为主的次高能滩微相为高连续低频中弱振幅波谷反射。高连续低频中强振幅波谷反射和高连续低频中弱振幅波谷反射以SW-NE向分布于研究区中央地带。以伽马值大于46 API为门槛值剔除泥岩、泥质粉砂岩等,得到介壳灰岩和含泥介壳灰岩的伽马数据体。精细刻画了高能滩微相介壳灰岩和次高能滩微相含泥介壳灰岩的分布范围,新增天然气有利区面积518 km²,为元坝地区大安寨段天然气储量和产量的增加奠定了坚实的基础。

关键词: 四川盆地, 元坝地区, 大安寨段, 灰岩, 储层预测

Abstract:

The shell limestone in the first submember of the Da’anzhai member (D1sm) of the Lower Jurassic Ziliujing Formation is an important natural gas reservoir in Yuanba area, Sichuan Basin. In this paper, we conducted an integrated study based on cores, thin sections, porosity and permeability data, oil test data, well logging data, and seismic data in order to predict the distribution of the shell-shoal limestone reservoir in the D1sm. The D1sm are composed of mainly shelly limestones and argillaceous shelly limestones. The shelly limestones have an average of porosity of 2.36% and an average of permeability of 0.02×10^-3 μm², while the argillaceous shelly limestones have an average of porosity of 4.59% and an average of permeability of 0.21×10^-3 μm². The shelly limestones in the D1sm comprise the high-energy shoal microfacies that developed in the shallow lake subfacies, and the argillaceous shelly limestones are interpreted as moderate-energy or subhigh-energy shoal microfacies. The classification of seismic waveform shows that the reflection characteristics of the high-energy shoal microfacies are well continuity, low frequency, moderate to large amplitudes, and wave troughs in the seismic profiles, and that the reflection characteristics of the moderate-energy shoal microfacies are well continuity, low frequency, moderate to small amplitudes, and wave troughs. These two types of waveforms distributed from southwest to northeast along the central part of the study area. The natural gamma data cube of the shelly limestones and argillaceous shelly limestones was constructed after rejecting the mudstones and muddy siltstones by giving the threshold value of 46 API. The distribution of shelly limestones (high-energy shoal microfacies) and argillaceous shelly limestones (moderate-energy shoal microfacies) was precisely mapped; the result shows that the favorable exploration area of natural gas has enlarged by about 518 km². The conclusions of this study provide a solid foundation for the increase of the natural gas reserves and production of the Da’anzhai member in Yuanba aera.

Key words: Sichuan Basin, Yuanba area, Da’anzhai member, limestone, reservoir prediction

中图分类号:

何志勇, 刘海涛, 肖伟, 杜红权. 四川盆地元坝地区下侏罗统介壳灰岩储层分布预测[J]. 现代地质, 2017, 31(01): 142-149.

HE Zhiyong, LIU Haitao, XIAO Wei, DU Hongquan. Distribution Prediction of Lower Jurassic Shell Limestone Reservoir in Yuanba Area of Sichuan Basin[J]. Geoscience, 2017, 31(01): 142-149.

图/表 9

图1 两种不同类型储层井沉积层序综合柱状图

Fig.1 Sedimentary sequence comprehensive column of two different types of reservoir wells

图2 元坝地区大安寨段一亚段下部介壳滩储层特征图版 (a)元坝102井,3 922.59 m,介屑灰岩,介壳碎片破裂堆积;(b)元坝16井,3 967.74 m,含泥介壳灰岩,壳体较完整,呈薄层条带状;(c)元坝122井,3 563.10 m,介壳灰岩,粒内微孔;(d)元坝101井, 4 213.00 m,介壳灰岩,粒间溶孔;(e)元坝102井,3 922.6 m,粒间充填沥青、黏土矿物形成黏土杂基微孔;(f) 元坝104井,3 709.36 m,含泥介壳灰岩,微裂缝缝宽0.1~0.3 mm;(g) 元坝102井,3 922.6 m,含泥介壳灰岩,微裂隙发育;(h);元陆4井,3 741.30 m,含泥介壳灰岩,内部溶蚀缝

Fig.2 The reservoir characteristics diagram of the lower part of the 1st submember of Da’anzhai member in Yuanba area

图3 元坝地区大安寨段一亚段下部沉积模式图

Fig.3 Depositional model of the lower part of the 1st submember of Da’anzhai member in Yuanba area

图4 不同类型介壳灰岩储层孔隙度渗透率交汇图

Fig.4 Cross plot porosity and permeability of different types of shelly limestone reservoir

图5 元坝地区大安寨段一亚段下部波形分类图

Fig.5 Waveform classification attribute map of the lower part of the 1st submember of Da’anzhai member in Yuanba area

图6 元坝地区大一亚段下部岩性波阻抗统计直方图

Fig.6 Histogram of impedance distribution of the lower part of the 1st submember of Da’anzhai member in Yuanba area

图7 元坝地区大一亚段下部伽马与泥质含量交汇图

Fig.7 Cross plot of GR and shale content of the lower part of the 1st submember of Da’anzhai member in Yuanba area

图8 元坝101-元坝102-元坝11-元坝107井连井伽马反演剖面

Fig.8 Connected well’ GR inversion profile through YB101-YB102-YB11-YB107

图9 元坝地区大一亚段下部沉积相图

Fig.9 Sedimentary facies of the lower part of the 1st submember of Da’anzhai member in Yuanba area

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