Reservoir characteristics and hydrocarbon accumulation significance of metamorphic zones of intrusive rocks and surrounding rocks in second member of Paleocene Funing Formation in Qintong Sag, Subei Basin
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摘要: 火山岩油气藏是油气勘探的重要领域之一。苏北盆地溱潼凹陷侵入岩分布广泛，油气显示活跃，已成为我国东部陆相盆地油气深化勘探和规模增储的重要领域，具备良好的勘探前景。然而，目前针对火山岩对泥页岩围岩储层及其成藏影响的研究较为缺乏，泥页岩围岩变质带能否作为勘探重点领域有待深入评价。为了推动苏北盆地侵入岩围岩变质带新类型油藏勘探，以溱潼凹陷阜二段侵入岩围岩变质带为研究对象，综合岩心、薄片、全岩、测井等资料，系统揭示了泥页岩变质带储层特征，明确了岩浆侵入对阜二段变质带油气成藏的贡献。研究表明，溱潼凹陷阜二段泥页岩受岩浆侵入影响，泥页岩围岩发生蚀变形成环状变质带储层，岩浆的侵入具有明显“增储作用”；变质带储层发育孔隙、裂缝两类储集空间，储层发育程度受侵入岩厚度及烘烤强度控制，岩浆的侵入具有“催熟作用”，同等深度下泥页岩Ro可增加0.4%~0.5%；阜宁组侵入岩形成于吴堡期—三垛期，火成岩侵入形成环状变质带的时间早于油气充注期，具有良好的成藏匹配关系。受岩浆侵入、侵入岩空间分布以及源储匹配关系控制，溱潼凹陷阜二段侵入岩围岩变质带具有源储一体、近源富集的特征，是规模增储的新阵地。Abstract: Volcanic reservoirs play a crucial role in oil and gas exploration. The intrusive rocks in the Qintong Sag of the Subei Basin are widely distributed within active oil and gas deposits, making them a significant area for further exploration and reserve expansion in East China's continental basins. Despite the promising exploration prospects, there is a research gap regarding the impact of volcanics on shale surrounding rock reservoirs and their accumulation potential. It is essential to evaluate whether the shale metamorphic zones could serve as a key exploration target. This study focuses on the metamorphic zones of intrusive rocks and surrounding rocks in the Qintong Sag's second member of the Funing Formation. By integrating core, thin section, whole rock, and well logging data, this work systematically reveals the reservoir characteristics of the mud shale metamorphic zones and defines the contribution of magma intrusion to hydrocarbon accumulation in the metamorphic zones. The results indicate that magma intrusion alters the mud shale of the Funing Formation, resulting in a circular metamorphic zone reservoir with enhanced reservoir properties. This reservoir exhibits two types of spaces, pores and fractures, with development dependent on the thickness and intensity of intrusive rocks. Magma intrusion also leads to a "ripening effect", increasing the Ro of mud shale by 0.4%-0.5% at the same depth. The intrusive rocks of the Funing Formation were formed during the Wubao to Sanduo periods. The intrusion of igneous rocks created a circular metamorphic zone prior to the hydrocarbon charging stage, indicating a favorable accumulation match. Influenced by magma intrusion, spatial distribution of intrusive rocks, and the source-reservoir relationship, the metamorphic zones of intrusive rocks and surrounding rocks in the second member of Funing Formation in the Qintong Sag exhibit characteristics of integrated source-reservoir and near-source enrichment. This presents a new opportunity for significant reservoir enhancement on a large scale.
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图 1 苏北盆地溱潼凹陷区域构造(a)、地震剖面(b)及综合地层特征(b)
Figure 1. Regional structure(a), seismic profile(b) and comprehensive stratigraphic characteristics(c) of Qintong Sag, Subei Basin
图 2 苏北盆地溱潼凹陷SD1井古新统阜宁组二段侵入岩及围岩岩石学特征
Figure 2. Petrological characteristics of intrusive rocks and surrounding rocks of second member of Paleocene Funing Formation in well SD1 of Qintong Sag, Subei Basin
图 3 苏北盆地溱潼凹陷古新统阜宁组二段侵入岩围岩储集空间特征
Figure 3. Reservoir space characteristics of intrusive rocks and surrounding rocks of second member of Paleocene Funing Formation in Qintong Sag, Subei Basin
图 4 苏北盆地溱潼凹陷古新统阜宁组二段泥页岩变质带储层物性
Figure 4. Physical properties of reservoirs in mud shale metamorphic zone of second member of Paleocene Funing Formation in Qintong Sag, Subei Basin
图 5 苏北盆地溱潼凹陷沙垛地区古新统阜宁组二段不同岩性测井响应特征
Figure 5. Relationship of response characteristics of different lithologies in second member of Paleocene Funing Formation in Shaduo area of Qintong Sag, Subei Basin
图 6 苏北盆地溱潼凹陷SD1井古新统阜宁组二段综合柱状图
Figure 6. Comprehensive histogram of second member of Paleocene Funing Formation in well SD1 of Qintong Sag, Subei Basin
图 7 苏北盆地溱潼凹陷SD1井锆石年龄谐和图
Figure 7. Zircon age harmony diagram of well SD1 in Qintong Sag, Subei Basin
图 8 苏北盆地溱潼凹陷阜宁组侵入岩与变质带储层厚度、孔隙度相关性
Figure 8. Correlation between reservoir thickness and porosity of intrusive rocks and metamorphic zones in Funing Formation, Qintong Sag, Suibei Basin
图 9 苏北盆地溱潼凹陷火山岩相关油藏成藏模式
Figure 9. Accumulation model of volcanic-related oil reservoirs in Qintong Sag, Subei Basin
表 1 苏北盆地溱潼凹陷SD1井古新统阜宁组二段侵入岩上变质带—泥页岩主量元素统计
Table 1. Statistics of principal elements of mud shale in metamorphic zone of intrusive rocks of second member of paleocene Funing Formation, well SD1, Qintong Sag, Subei Basin
% 样品深度(岩性) SiO2 TiO2 Al2O3 Fe2O3 MnO MgO CaO Na2O K2O P2O5 LOI 3 520 m(正常泥页岩) 65.79 0.235 6.79 3.28 0.190 1.12 9.56 0.77 0.82 0.138 12.23 3 522 m(正常泥页岩) 49.95 0.421 9.92 3.91 0.123 2.83 13.95 1.83 1.31 0.164 14.32 3 545 m(蚀变泥页岩) 58.03 0.742 16.84 7.11 0.000 0.11 1.63 9.24 2.58 0.127 3.59 3 546 m(蚀变泥页岩) 59.64 0.458 12.72 5.57 0.121 3.08 9.00 7.43 1.14 0.150 0.79 3 546.6 m(蚀变泥页岩) 45.48 0.227 15.47 3.16 0.210 3.74 26.77 0.28 0.02 0.236 4.70 
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表 2 苏北盆地溱潼凹陷SD1井侵入岩—变质带—正常泥页岩碳、氧同位素分析结果
Table 2. C and O isotopes of intrusive rock, metamorphic zone and normal mud shale in well SD1 in Qintong Sag, Subei Basin
样品深度/m 矿物 δ18OSMOW/‰ δ13CVPDB/‰ 备注 3 520.0 泥页岩中方解石 19.70 0.18 正常泥页岩 3 522.0 泥页岩中方解石 20.09 0.02 正常泥页岩 3 546.6 蚀变泥页岩中方解石 17.57 -16.66 上蚀变带 3 550.2 辉绿岩中方解石 16.04 -13.37 辉绿岩 3 587.8 橄榄辉长岩中方解石 15.78 -13.20 辉绿岩 3 595.5 橄榄辉长岩中方解石 17.03 -14.55 辉绿岩 3 618.4 热变质泥岩中方解石 19.79 -15.72 下蚀变带
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