Geological features and exploration potential of Permian Tiaohu Formation tight oil, Santanghu Basin, NW China

Liang, Hao; Li, Xinning; Ma, Qiang; Liang, Hui; Quan-sheng, Luo; Chen, Xuan; Bai, Guojuan; Zhang, Qi; Meng, Yuanlin

doi:10.1016/s1876-3804(14)60073-2

Cited by 51 publications

(20 citation statements)

References 5 publications

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“…Based on a comprehensive geological study of controlling factors of petroleum accumulation, comprehensive indexes such as oil generation conditions, preservation conditions, trap conditions, facies control conditions, reservoir conditions, migration conditions, oil-bearing property of oil layers, [23,24] suggested the "six characteristics" to evaluate source control, lithology, physical properties, brittleness, oil and gas properties, and stress anisotropy, comprehensively considering geological and engineering factors and finally evaluating areas favorable for tight oil development. Considering the geological "sweet spot" and engineering quality, Liang et al [25] created an "eight properties" evaluation method, which included light source rock specialization, lithology, oilbearing properties, physical properties, electrical properties, brittleness, in situ stress anisotropy, and sensitivity. Pang et al [26] used four indicators to evaluate a favorable area, including source rock, porosity, profitable reservoir rock thickness, and fractures in the area.…”

Section: Favorable Area Of Tight Oil Developmentmentioning

confidence: 99%

Development Favorable Area and Productivity Potential Evaluation Method of a Tight Oil Reservoir

et al. 2021

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Tight oil resources have become the focus of unconventional oil and gas exploration and development. Well placement is an essential factor determining the development of a field. Oil wells should be located in the area with favorable criteria for development. These areas should be screened based upon oil and gas enrichment of the reservoir. The influencing factors and analysis theory of an enrichment area are summarized in this paper. Two types of methods evaluating areas favorable for tight oil and gas production are explained here as well, including model prediction and the combination of geological modeling and reservoir simulation. The area with favorable geological, engineering, and economic attributes has the best development potential. The productivity potential can be used as one basis for selecting areas favorable for production. Based on the previous concept of productivity potential, combined with the characteristics of a tight oil reservoir, this study modified the evaluation of productivity potential, and the calculated potential area was the priority for well placement. The modified equation of productivity potential comprehensively considers effective pore pressure, mobile oil saturation, porosity, permeability, effective thickness, distance from the boundary, and threshold pressure gradient. A tight reservoir was taken as an example for calculation, and the results of the modified method, original productivity potential method, and reserve abundance calculation method are discussed. Two new wells were arranged in the favorable areas obtained by different productivity potential evaluation methods, and the production was calculated under the same parameters for each method. The recovery of this area was 51.65%, which is 1.73% and 2.84% higher than that of the other two methods.

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Section: Favorable Area Of Tight Oil Developmentmentioning

confidence: 99%

Development Favorable Area and Productivity Potential Evaluation Method of a Tight Oil Reservoir

et al. 2021

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“…The primary source rock is the Middle Permian Lucaogou Fm. The oil reservoirs of the Permian interval mainly consist of mudstone, dolomitic shale or limestone-rich mudstone/marl, argillaceous limestone, and calcareous dolomite within the Lucaogou Formation (P 2 l) source rock of the middle Permian (Liang et al 2014), making it overall a self-sourced reservoir. The first well Ma1 was drilled in 1996 targeting interbedded intervals of fractured tight carbonates producing at a rate of 3.3 tonnes (24 barrels)/day.…”

Section: Hybrid Plays Cases Within Middle Permian Mixed Siliciclasticmentioning

confidence: 99%

Multiple-stacked Hybrid Plays of lacustrine source rock intervals: Case studies from lacustrine basins in China

et al. 2017

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Hydrocarbon-producing lacustrine basins are widely developed in the world, and China has a large number of lacustrine basins that have developed since the early Permian. The organic-rich shale-dominated heterogeneous source rock intervals in Chinese lacustrine basins generally contain frequent thin interbeds of stratigraphically associated sandstone, siltstone, marl, dolomite, and limestone. The concept of ''Hybrid Plays'' as put forth in this article recognizes this pattern of alternating organicrich shale and organic-lean interbeds and existence of mixed unconventional and conventional plays. Hybrid Plays in lacustrine source rock intervals present a unique closed petroleum system hosting continuous hydrocarbons. The interbedded organic-lean siliciclastic and/or carbonate plays are efficiently charged with hydrocarbons via short migration pathways from the adjacent organic-rich shale that is often also a self-sourced play. We assert ''Hybrid Plays'' provide the most realistic exploration model for targeting multiple-stacked and genetically related very tight shale, tight and conventional plays together in the entire source rock interval rather than individual plays only. The Hybrid Play model has been proven and works for a wide variety of lacustrine rift, sag and foreland basins in China.

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“…With the continuous depletion of conventional oil and gas resources and the huge demand for oil and gas resources due to rapid economic development, the exploration and development of unconventional oil and gas resources have become more and more important. − In recent years, the Tuha oilfield has conducted a lot of geological exploration and oil and gas testing in the Santanghu Basin in northeastern Xinjiang, China, and finally discovered a new type of tight oil reservoirs, called tight sedimentary tuff reservoirs (TSTRs). − The formation of TSTRs is closely related to volcanic eruption and lake-basin deposition of volcanic ash. The exploration and development results show that TSTRs are significantly different from conventional tight oil reservoirs in terms of the reservoir-forming model, lithology, physical properties, and fluid properties. − …”

Section: Introductionmentioning

confidence: 99%

Study on Influencing Factors of Water Huff-n-Puff Oil Recovery in Matrix-Fracture Systems of the Tight Sedimentary Tuff Reservoirs

Yang

Jin

et al. 2022

ACS Omega

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Tight sedimentary tuff reservoirs (TSTRs) are a new type of tight oil reservoirs, which are mainly developed by water huff-n-puff (WHP). However, there is no quantitative study on the effect of water injection pressure (WIP) and fracture density (FD) on the oil recovery effect of WHP, and the reasons for the low flow-back rate (FR) of the injected water are also not fully explained. In this study, the real cores of TSTRs were used to simulate the seepage state of the matrix-fracture systems of the reservoir, the effects of WIP and FD on the WHP were quantitatively studied, and the reasons for the low FR of the injected water were comprehensively analyzed. The result shows that in five cycles of WHP, the recovery factor (RF) of the core only increases from 8.72 to 10.91% with the WIP increasing from 25 to 30 MPa. However, when the WIP is 40 MPa (rock breakdown pressure), the RF of the core reaches 16.47%, indicating that overfracture-pressure water injection has an obvious improvement effect on the oil recovery effect of WHP in TSTRs. Increasing the FD can also significantly improve the RF and oil recovery efficiency (ORE) of WHP in TSTRs. When the FD of the core increases from 0.34 to 0.44 cm –1 , the RF of five cycles of WHP increases by 9.26%, the ORE increases by 8.61%, and the FR of the injected water decreases by 0.56%. The reasons for the low FR of the injected water in WHP in tight oil reservoirs are matrix water locking, fracture water locking, and reservoir nonconstant-volume water locking. The study can provide an important reference for the efficient development of the WHP in TSTRs.

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Geological features and exploration potential of Permian Tiaohu Formation tight oil, Santanghu Basin, NW China

Cited by 51 publications

References 5 publications

Development Favorable Area and Productivity Potential Evaluation Method of a Tight Oil Reservoir

Development Favorable Area and Productivity Potential Evaluation Method of a Tight Oil Reservoir

Multiple-stacked Hybrid Plays of lacustrine source rock intervals: Case studies from lacustrine basins in China

Study on Influencing Factors of Water Huff-n-Puff Oil Recovery in Matrix-Fracture Systems of the Tight Sedimentary Tuff Reservoirs

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