Characteristics of Longwangmiao reservoirs in Penglai gas area and comparison with those in Moxi-Gaoshiti area, central Sichuan Basin
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摘要: 川中蓬莱气区下寒武统龙王庙组钻遇良好碳酸盐岩储层，天然气显示好，成为继川中地区安岳大气田后龙王庙组重点勘探区之一，但储层发育规律不明制约了勘探部署。基于最新的钻井及分析测试等资料，系统分析了蓬莱气区龙王庙组储层特征及主控因素。研究认为，蓬莱气区龙王庙组具有陆源碎屑与碳酸盐混合沉积背景，储层主要分布在龙王庙组中上部；储集岩石类型主要为(残余)颗粒白云岩和结晶白云岩；储集空间类型主要为粒间溶孔、粒内溶孔、晶间溶孔及微裂缝；以低孔低渗储层为主，储层厚度主要介于10~42 m之间。储层发育受控于层序地层、岩性及成岩作用等，进积型准层序组和准层序中上部的(残余)颗粒白云岩和结晶白云岩是储层发育主要部位，大气淡水溶蚀、油气溶蚀作用及破裂作用是核心建设性成岩作用。对比安岳大气田主体区磨溪—高石梯地区，认为储层主控因素相近，主要受颗粒白云岩、溶蚀作用、破裂作用等控制，但蓬莱气区龙王庙组储层具有灰质含量高、陆源碎屑含量多、准同生期暴露弱等特点，寻找准同生期暴露的高能颗粒白云岩和细晶白云岩及表生岩溶改造的白云岩是蓬莱气区重点关注的储层目标。Abstract: The Lower Cambrian Longwangmiao Formation in the Penglai gas area has promising carbonate reservoirs and exhibit strong gas indications, making itself a pivotal exploration zone following the Anyue gas field in the central Sichuan region. However, the lack of clarity regarding reservoir development patterns has constrained exploration deployment. Through comprehensive analysis of the most recent drilling and testing data, this study systematically examines the reservoir characteristics and primary controlling factors of the Longwangmiao Formation in Penglai gas area. Results reveal a mixed sedimentary background of terrigenous debris and carbonate, with reservoirs predominantly situated in the middle and upper strata of the Longwangmiao Formation. The reservoir rock types are predominantly (residual) granular dolomite and crystalline dolomite. Main types of reservoir space include intergranular dissolved pores, intragranular dissolved pores, intercrystalline dissolved pores, and micro-fractures. The reservoir is characterized by low porosity and permeability, with thickness typically ranging between 10-42 m. Reservoir development is controlled by sequence stratigraphy, lithology and diagenesis, particularly evident in the granular dolomite and crystalline dolomite within the middle and upper sections of the progradational parasequence set. Key constructive diagenetic processes include atmospheric freshwater dissolution, oil and gas dissolution and fracture. A comparison with the Moxi-Gaoshiti area in the main area of Anyue gas field suggests similar controlling factors, primarily revolving around granular dolomite, dissolution and fracturing. Nonetheless, the Longwangmiao Formation reservoir in Penglai gas area exhibit distinctive traits such as high ash content, elevated terrigenous clastic content and limited penecontemporaneous exposure. Consequently, identifying high-energy granular dolomite and fine-grained dolomite exposed during the penecontemporaneous period, as well as dolomite modified by supergene karst, emerges as imperative in targeting reservoirs within the Penglai gas area.
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图 2 川中地区蓬莱气区下寒武统龙王庙组岩石类型占比圆饼图
基于12口井岩性厚度数据统计。
Figure 2. Pie chart of rock types in the Lower Cambrian Longwangmiao Formation of the Penglai gas area, central Sichuan Basin
图 3 川中地区蓬莱气区下寒武统龙王庙组典型岩性照片
Figure 3. Typical lithological characteristics of Lower Cambrian Longwangmiao Formation in Penglai gas area, central Sichuan Basin
图 4 川中地区蓬莱气区下寒武统龙王庙组储层典型储集空间类型照片
Figure 4. Typical reservoir space type of Lower Cambrian Longwangmiao Formation in Penglai gas area, central Sichuan Basin
图 5 川中地区蓬莱气区和磨溪—高石梯地区下寒武统龙王庙组储层孔渗频率分布直方图
Figure 5. Porosity-permeability histograms of Lower Cambrian Longwangmiao Formation reservoir in Penglai gas area and Moxi-Gaoshiti area, Sichuan Basin
图 6 川中地区蓬莱气区和磨溪—高石梯地区下寒武统龙王庙组储层孔渗交会图
Figure 6. Porosity-permeability cross plots of Lower Cambrian Longwangmiao Formation reservoir in Penglai gas area and Moxi-Gaoshiti area, Sichuan Basin
图 7 川中地区蓬莱气区下寒武统龙王庙组不同岩性物性频率分布直方图
Figure 7. Frequency distribution of different lithological physical properties of Lower Cambrian Longwangmiao Formation in Penglai gas area, central Sichuan Basin
图 8 川中地区蓬莱气区和磨溪—高石梯地区典型井下寒武统龙王庙组沉积特征及储层综合柱状图
Figure 8. Sedimentary characteristics and reservoir comprehensive histogram of typical wells in Penglai gas area and Moxi-Gaoshiti area, Sichuan Basin
图 9 川中地区蓬莱气区与磨溪―高石梯地区下寒武统龙王庙组岩性对比剖面
剖面位置见图 1。
Figure 9. Lithology contrast profile of Longwangmiao Formation between Penglai gas area and Moxi-Gaoshiti rea, central Sichuan Basin
图 10 川中地区蓬莱气区下寒武统龙王庙组储层发育模式
Figure 10. Reservoir development model of Lower Cambrian Longwangmiao Formation in Penglai gas area, central Sichuan Basin
图 11 川中地区蓬莱气区与磨溪—高石梯地区下寒武统龙王庙组储集空间类型对比
Figure 11. Comparison of reservoir space types of Lower Cambrian Longwangmiao Formation between Penglai gas area and Moxi-Gaoshiti area, Sichuan Basin
表 1 川中地区蓬莱气区下寒武统龙王庙组主要沉积微相物性统计
Table 1. Statistics of physical properties of main sedimentary microfacies of Lower Cambrian Longwangmiao Formation in Penglai gas area, central Sichuan Basin
沉积微相 孔隙度/% 渗透率/10-3 μm2 样品总数/块 最大值 最小值 平均值 最大值 最小值 平均值 鲕粒滩 7.08 0.48 1.670 2.810 0.003 6 0.198 0 18 灰云坪 1.14 0.85 0.995 0.109 0.008 2 0.009 5 2 泥云坪 5.41 0.90 1.850 1.470 0.013 3 0.224 0 7 砂屑滩 10.11 0.35 3.360 7.690 0.002 3 0.373 0 34 云坪 8.94 0.35 2.330 4.610 0.000 6 0.288 0 48 
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表 2 川中地区蓬莱气区和磨溪—高石梯地区下寒武统龙王庙组储层特征对比
Table 2. Comparison of reservoir characteristics of Lower Cambrian Longwangmiao Formation in Penglai gas area and Moxi-Gaoshiti area, Sichuan Basin
地区 岩性 物性 储集空间类型 成岩作用 沉积相 主控因素 孔隙度大于2% 储层厚度/m 磨溪—高石梯地区 颗粒云岩、晶粒云岩为主；颗粒云岩主要包括砂屑云岩与鲕粒云岩，晶粒云岩主要包括粉—细晶云岩及花斑状粉晶云岩 小柱塞样孔隙度为2.00%~18.48%，平均4.27%，全直径样品孔隙度为2%~11%，总平均孔隙度为4.95%；小柱塞样基质渗透率为(0.001~1)×10-3 μm2，大于0.1×10-3 μm2的占34.5%，平均为1.59×10-3 μm2，全直径样品分析渗透率为(0.01~78.5)×10-3 μm2，总平均渗透率为4.71×10-3 μm2，总体为低孔低渗、局部低孔高渗 以次生孔、洞、缝为主，偶见残余原生孔隙。包括粒间溶孔、晶间(溶)孔，少量粒内溶孔、铸模孔、残余粒间孔及膏模孔；裂缝包括构造缝、溶蚀缝、压溶缝 破裂作用、压实压溶作用、胶结作用、白云化作用(准同生期海水白云化、早成岩期大气淡水白云化、中—晚成岩期埋藏白云化)、溶蚀作用(准同生期溶蚀作用、表生期顺层溶蚀作用、埋藏溶蚀作用) 泥云坪、砂云坪、颗粒滩、滩间海，总体属局限台地沉积 古地理环境、沉积相、海平面变化、古构造 20~60 蓬莱气区 砂屑云岩、砂质云岩、晶粒云岩、灰质云岩为主。其中晶粒云岩中粉晶白云岩占比最大，细晶白云岩次之，中晶白云岩占比最小 孔隙度为0.34%~10.11%，平均为2.36%，主要介于0.5%~2.5%之间；渗透率为5.72×10-7~9.56×10-3 μm2，平均为0.38×10-3 μm2，主要介于(0.001~1)×10-3 μm2之间，总体低孔低渗 以次生孔、洞、缝为主，包括晶间溶孔、粒间溶孔、粒内溶孔等；裂缝包括构造缝、溶蚀缝 溶蚀作用、破裂作用、压实压溶作用、胶结作用、白云化作用 混积滨岸、灰云坪、颗粒滩、云坪 岩性、层序地层、沉积相、成岩作用 6~18 注：磨溪—高石梯地区龙王庙组储层特征统计来自参考文献[13, 24-25, 28-30]。
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