Analysis of the Accumulation Conditions for Volcanic Gas Reservoirs: A Case from Deep Yingcheng Formation, Southern Part of Songliao Basin

2013 ◽  
Vol 848 ◽  
pp. 273-278
Author(s):  
Yi Wu ◽  
Wei Chao Tian
Keyword(s):  
Large Scale ◽  
Volcanic Rocks ◽  
Songliao Basin ◽  
Gas Reservoirs ◽  
Volcanic Gas ◽  
Gas Reservoir ◽  
Rock Types ◽  
Yingcheng Formation ◽  
Study Results ◽  
Reservoir Conditions

Volcanic gas reservoir in deep Southern Songliao Basin has became source for incremental oil and reserves. Due to the low degree of exploration, study on the accumulation condition for volcanic gas reservoir is insufficient, to some extent, influencing the effectiveness of exploration. In this paper, the accumulation conditions for volcanic gas reservoir have been analyzed systematically including the source rock conditions, reservoir conditions, sealing conditions, conducting conditions and trap conditions. The study results show that large-scale coal-bearing strata in Shahezi Formation can provide sufficient gas for volcanic gas reservoir: the fracture systems in deep volcanic rocks can communicate with the earlier developed pores, fractures and caves, forming good reservoir and flow space; It contains multiple rock types with good preservation condition, the mudstone in first member of Quan Formation is better regional seal. Mudstone in third and fourth member of Denglouku Formation and Shahezi Formation are favorable local seals, with good seal capability for volcanic rocks gas accumulation in Yingcheng Formation. ontains three types of transporting pathways: permeable formation, unconformity and fault.

scholarly journals Accumulation and Distribution of Natural Gas Reservoir in Volcanic Active Area: A Case Study of the Cretaceous Yingcheng Formation in the Dehui Fault Depression, Songliao Basin, NE China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Fancheng Zeng ◽  
Bo Liu ◽  
Changmin Zhang ◽  
Guoyi Zhang ◽  
Jin Gao ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Gas ◽  
Volcanic Rocks ◽  
Songliao Basin ◽  
Exploration And Exploitation ◽  
Gas Reservoirs ◽  
Tight Sandstone ◽  
Gas Reservoir ◽  
Yingcheng Formation ◽  
Pore Types

Tight gas sandstone and volcanic gas reservoirs have received global attention in the energy arena for further exploration and exploitation attempts. Considering the Yingcheng Formation of Dehui fault depression in the Songliao Basin as an example, this study focused on the accumulation and distribution of natural gas reservoirs in volcanic area in a fault depression basin. Volcanic activities occurred in the Yingcheng Formation, which is distributed centrally in the northwest of the study area. During the sedimentation of the Yingcheng Formation, fan-delta, lacustrine, and nearshore subaqueous fan facies were deposited. The source rocks of the Yingcheng Formation have high abundance of organic matter mainly in type III at high-overmature stages, indicating favorable conditions for gas production. The porosity of volcanic reservoir is 3.0%-14.8%, the permeability is 0.0004 mD-2.52 mD, and the pore types are mainly secondary dissolved pores and fractures. Besides, the porosity of the tight sandstone reservoir is 0.5%-11.2%, and the permeability is 0.0008 mD-3.17 mD. The pore types are mainly interparticle pores, with a small proportion of intraparticle pores and microfractures. The intrusion of late volcanic magma provided sufficient heat for the thermal maturity progression of organic matter in Yingcheng Formation and promoted the generation of natural gas in large quantities. Volcanic rocks formed at the early and middle stages of volcanic activities occupied the sedimentary space and hindered the development of sedimentary sand bodies to a certain extent. However, volcanic rocks can become the seal to promote the formation of tight sandstone gas traps. Comparing tight sandstone reservoirs with volcanic ones, the latter are less affected by compaction; thus, their petrophysical properties do not vary much with depth, showing more homogeneous characteristics. The pyroclastic rocks influenced by volcanic activity and the secondary pores formed by dissolution in the later stages also provide reservoir space for gas accumulation. Ultimately, the tight sandstone and volcanic rocks in the study area form a complex gas reservoir system, which can become a reference for exploration and exploitation of natural gas in other petroliferous fault depressions that are affected by volcanisms.

scholarly journals Evaluation of volcanic gas reservoir in Yingcheng formation of Block Shengshen2-1 of Northern Part of Songliao Basin

2019 ◽  
Vol 118 ◽  
pp. 03033
Author(s):  
Yue Zhou ◽  
Haibo Wu
Keyword(s):  
Volcanic Rocks ◽  
Gas Content ◽  
Composition Analysis ◽  
Physical Analysis ◽  
Volcanic Gas ◽  
Thin Sections ◽  
Rock Density ◽  
Yingcheng Formation ◽  
Log Interpretation ◽  
Well Data

According to the thin sections of volcanic rocks, chemical composition analysis and log interpretation, and well data, it is determined that the volcanic rocks of Yingcheng Formation in Shengshen 2-1 block are mainly intermediate-acid volcanic lava and pyroclastic rocks. Through physical analysis of core samples, it is considered that Shengshen 2-1 block belongs to low-porosity and low-permeability reservoir. Microfracture-fracture is relatively developed in the compact section, and fracture is not developed in the porous section. Microfracture and reticular fracture can be seen in the thin section. Statistical analysis of porosity and density of volcanic reservoir shows that volcanic rock density below 2.53 can be used as reservoir. According to the relationship between reservoir space and gas content, the characteristics of volcanic lithology, lithofacies and reservoir space, the reservoir in this block can be divided into four types.

The Effect of Stress-Sensitivity on Gas well Production in Volcanic Gas Reservoirs

2014 ◽  
Vol 962-965 ◽  
pp. 636-641
Author(s):  
Tian Qing ◽  
Peng Cheng Liu ◽  
Zong Yao Qi
Keyword(s):  
Volcanic Rocks ◽  
Development Program ◽  
Prediction Method ◽  
Stress Sensitivity ◽  
Gas Production ◽  
Gas Reservoirs ◽  
Volcanic Gas ◽  
Exponential Relationship ◽  
Gas Well ◽  
Well Productivity

During the volcanic gas reservoirs development, stress-sensitivity will result in permeability decline with formation pressure drop, lowering gas production and affecting the whole gas reservoirs development program. On the basis of the stress-sensitivity experiments on volcanic rocks, the characteristic of stress-sensitivity in volcanic reservoirs is analyzed. On this basis, this paper studies the prediction method of gas well productivity in volcanic gas reservoirs with stress-sensitivity, and establishes the mathematical model of constant pressure production in volcanic gas reservoirs. The results show that the permeability of volcanic rocks has an exponential relationship with effective stress. The stronger the stress-sensitivity is, the more the gas well productivity losses under the same conditions. And the reservoir stress-sensitivity will increase the degree of gas well unsteady production decline.

Spatial and temporal distributions of the late Mesozoic volcanic successions and their controlling effects on the Changling fault depression of the Songliao Basin, northeast China

2017 ◽  
Vol 54 (12) ◽  
pp. 1194-1213 ◽  
Author(s):  
Wenbo Chang ◽  
Xuanlong Shan ◽  
Jian Yi ◽  
Tiantian Du ◽  
Yue Qu
Keyword(s):  
Partial Melting ◽  
Fractional Crystallization ◽  
Early Stage ◽  
Volcanic Rocks ◽  
Songliao Basin ◽  
Basic Magma ◽  
Small Scale ◽  
Late Mesozoic ◽  
Yingcheng Formation ◽  
Well Data

Volcanic successions, including their spatial, temporal, tectonic, and geochemical attributes, were identified based on well data, 2D and 3D seismic data, U–Pb isotopic ages, and major and trace element data from the Changling fault depression of the Songliao Basin in northeastern China. Three eruption cycles developed in the Changling fault depression: K1h (Huoshiling Formation) (124–118 Ma), K1yc1 (first member of the Yingcheng Formation) (115–106 Ma), and K1yc3 (third member of the Yingcheng Formation) (106–102 Ma). These three eruption cycles comprised seven eruption stages. The volcanic successions in every eruption cycle were bimodal and evolved from basic to acidic. The magma of the basic and intermediate rocks in these cycles was derived from partial melting of the asthenosphere. In K1yc1 and K1yc3, partial melting of the newly formed basic rocks in the lower crust formed the high-SiO2 acidic magma. In addition, fractional crystallization of basic magma formed the small-scale intermediate–acidic magma. In K1h, the most likely origin of the acidic magma was fractional crystallization of basic magma. During the early stage of the fault depression, the volcanic rocks of K1h were controlled primarily by the boundary fault activity. In K1yc1 and K1yc3, basic–intermediate rocks were distributed widely along syngenetic faults, and acidic rocks were concentrated in areas where the syngenetic faults had their largest amplitudes. Multiple cycles and stages of the volcanic successions were controlled by magmatic evolution, and the spatial distribution was controlled by basin tectonics.

scholarly journals Geochemical analysis and origin of gas in volcanic reservoirs in the Songliao Basin

2017 ◽  
Vol 35 (3) ◽  
pp. 295-314 ◽  
Author(s):  
Shizhen Tao ◽  
Changwei Li ◽  
Weijiao Ma ◽  
Deliang Liu ◽  
Jingkui Mi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Fluid Inclusions ◽  
Volcanic Rocks ◽  
Fault Zones ◽  
Songliao Basin ◽  
Low Carbon ◽  
Gas Reservoirs ◽  
Wide Range ◽  
Volcanic Reservoirs

Volcanic reservoirs are extensive in the Songliao Basin and mainly include intermediate-basic rocks in the northern part, intermediate-acidic rocks in Xujiaweizi in the southern part, and acidic rocks in the Jinglin block. The natural gas in the volcanic reservoirs of the Songliao Basin has a wide range of compositions, with alkanes being dominant in most cases, although carbon dioxide is dominant in some wells. Generally, the gas in the volcanic rocks near deep faults has high contents of carbon dioxide, whereas the natural gas in volcanic rocks far from faults has low carbon dioxide contents. The gas in the volcanic reservoirs is of multiple origins, including abiogenic gas of probable mantle origin (generally found in wells with high carbon dioxide contents) and organic gas mainly derived from organic matter in the basin. The abiogenic alkanes have δ13C values in the order of δ13C1 > δ13C2 > δ13C3 > δ13C4, which is opposite that of alkanes of organic origin. The 3He/4He ratios of the fluid inclusions from the volcanic reservoirs range from 0.286 × 10−6 to 7.33 × 10−6, with an average of 2.48 × 10−6, and the R/Ra ratios range from 0.26 to 5.24, with most values being greater than 1.0, indicating mixed origins of noble gases from the crust and the mantle. The gas in fluid inclusions from the volcanic reservoirs has δ13C1 values ranging from −17.1 to −28.7‰ (PDB), δ13C2 values ranging from −23.4 to −32.4‰ (mostly approximately −25‰), and δ13Cco2 values ranging from −10.97 to −21.73‰, which are significantly different from the isotopic compositions of the gas in the present reservoirs, suggesting that some abiogenic alkanes may have been charged into the reservoirs during the geologic history of the basin. The early charged CO2 is mainly organic in origin, while the abiogenic CO2 was charged during the main accumulation period, producing a mix of origins for the gas in the volcanic reservoirs of the Songliao Basin. The abiogenic alkanes, He, and CO2 in the natural gas indicate the addition of some abiogenic gas to the gas. According to the relationship between the distribution and attitude of volcanic rocks and faults, we found that the abiogenic gas reservoirs are located near fault zones, whereas the organic and mixed gas reservoirs are located far from fault zones. The geochemical study of natural gas is helpful in determining the origin and spatial distribution patterns of gas in deep volcanic reservoirs and for directing further gas exploration in the Songliao Basin.

scholarly journals Characterization of a Volcanic Gas Reservoir Using Seismic Dispersion and Fluid Mobility Attributes

Lithosphere ◽  
2021 ◽  
Vol 2021 (Special 3) ◽  
Author(s):  
Zhiqi Guo ◽  
Yuedong Li ◽  
Cai Liu ◽  
Da Zhang ◽  
Anbang Li
Keyword(s):  
Bulk Modulus ◽  
Velocity Dispersion ◽  
P Wave ◽  
Inversion Method ◽  
High Porosity ◽  
Gas Reservoirs ◽  
Volcanic Gas ◽  
Gas Reservoir ◽  
Gas Saturation

Abstract Seismic dispersion and fluid mobility attributes are used to characterize a volcanic gas reservoir in the Songliao Basin of China. A rock physics model is constructed to describe poroelastic behaviors associated with heterogeneous fluids saturation within the volcanic gas reservoirs, where velocity dispersion and attenuation of propagating waves are attributed to the wave-induced fluid flow described by the patchy saturation theory. Modeling results indicate that the frequency-dependent bulk modulus at the seismic frequency is more sensitive to gas saturation than the P-wave velocity dispersion. Accordingly, a new inversion method is developed to compute bulk-modulus-related dispersion attribute DK for improved characterization of volcanic gas reservoirs. Synthetic tests indicate that DK is more sensitive than traditional P-wave dispersion attribute DP to the variations of reservoir properties. The high value of dispersion attribute DK indicates the volcanic gas reservoirs with high porosity and gas saturation. At the same time, fluid mobility attribute FM can discriminate the volcanic gas reservoir as DK. Field data applications illustrate that DK and FM exhibit anomalies to the gas zones in the volcanic gas reservoir on the cross-well section. However, DK is more robust than FM to identify favorable zones on horizontal slices for specific target layers. Overall, rock physical modeling provides insights into the poroelastic behaviors of volcanic gas reservoirs, and inversion for seismic dispersion attribute DK improves hydrocarbon detection in the volcanic gas reservoir.

Petrogenesis of the Masirah ophiolite Me'lange at Ras Madraka, Oman

2020 ◽  
Author(s):  
Sobhi Nasir
Keyword(s):  
Indian Ocean ◽  
Large Scale ◽  
Volcanic Rocks ◽  
Geochemical Data ◽  
Metamorphic Rocks ◽  
Rock Types ◽  
Tectonic Events ◽  
History Of ◽  
The Indian Ocean

<p>The Masirah nappes are represented by allochthonous Late Jurassic to Cretaceous volcanic rocks and ophiolites well as Permian to Maastrichtian marine sediments, obducted onto the Oman continental margin at the cretaceous/Tertiary boundary (Schreurs and Immenhauser, 1999). The Masirah ophiolite forms a straight NNE-SSW trending strip 40 km wide, extending 450 km from Ras Madrakah to the Batain coast. The ophiolite is truncated by the ophiolitic mélange (known as Masirah Mélange) which makes a high angle with the sheeted dike trend and has been interpreted as a transform fault zone (Moseley and Abbotts 1979). The Masirah Mélange shows all the features characteristic of a tectonic mélange, in particular indefinite, non-stratigraphic, contacts and scanty matrix, indicating that it is not a diapiric mélange (Shackletonet and Ries.1990). The blocks within the mélange range in size from several kilometers to a few meters and are composed of blocks of all the rock types of the ophiolite beside metamorphic rocks. Metamorphic rocks from RasMedraka Mélange are mainly composed amphibolite, two mica gneiss, and schist. The amphibolite consists of hornblende, plagioclase, clinopyroxene, sphene, chlorite, epidote, calcite, quartz, biotite, prehnite, magnetite, and ilmenite. Geochemical data shows amphibolites have similar MORBgeochemical characteristics. The Masirah ophiolite and mélange preserve a very long (80 Ma) history of igneous and sedimentary activity prior to emplacement onto the Arabian continental crust. However, dating of the mélange is so far proving difficult. It clearly post-dates the main ophiolite and pre-dates the early Tertiary (Shackletonet al. 1990).</p><p>This study is focused on providing age constraints for the amphibolite and greenschist facies metamorphic rocks of the Masirah Mélange in Ras Madraka by 40Ar ⁄ 39Ar dating. All 40Ar ⁄ 39Ar results were obtained in the ALF Argonlab, Freiberg University, Germany.  Most of the samples show large degrees of Ar-loss or, in some cases, the presence of an excess Ar component, reflected by disturbed age spectra. In general, however, the large number of temperature steps measured in one hornblende sample allows the determination of well-constrained inverse isochron ages that generally provide a more robust error estimate than plateau ages. Laser stepwise heating of these hornblende samples yielded flat age spectra with plateau ages of 83.8+0.96 Ma.</p><p>The Indian Ocean was characterized by stepwise breakup of east and west Gondwana at 157 Ma, breakup of east Gondwana at 130 Ma, Madagascar and India/Seychelles at 95–84 Ma, India and Seychelles at 65 Ma, and, finally at40 Ma, rifting between Africa and Arabia Peters, 2000; Nasir 2016). The range from 160 Ma to 80 Ma suggests that magmatic activity in the Masirah ophiolite was more or less continuous over a period of ~80 Ma, and correlates with large-scale tectonic events recorded in the early Indian Ocean at 80-160 Ma. The 40Ar ⁄ 39Ar ages indicate that hornblende formed before 84 Ma and this age can be interpreted as cooling ages dating approximately the formation of the plastic deformation and abduction. We attribute the Masirah Mélange to the Madagascar and India/Seychelles breaking event at 95–84.</p>

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