TSR, deep oil cracking and exploration potential in the Hetianhe gas field, Tarim Basin, China

Zhu, Guangyou; Zhang, Ying; Zhou, Xiaofeng; Zhang, Zhiyao; Du, Debin; Shi, Shengbao; Li, Tingting; Chen, Weiyan; Han, Jianfa

doi:10.1016/j.fuel.2018.08.119

Cited by 40 publications

(32 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All these facts indicate unfavorable conditions to initiate TSR in these reservoirs. However, abundant diamondoids and some thiadiamondoids were detected in Ma3 and Ma401 condensates, and the sulfur isotopic compositions of H 2 S (21.27 and 20.28‰, Table ) are close to deeper Cambrian gypsum (averaging 31.0‰) . Combined with reconstruction of the geologic evolution of the Tarim Basin, the Ma3 and Ma401 oil and gas are believed to have migrated from deeper Cambrian strata .…”

Section: Resultsmentioning

confidence: 94%

“…The current burial depths of LS2, ZS1C, Ma3, and Ma401 condensates are 5741–5830 m (the lower Ordovician), 6861–6944 m (the lower Cambrian), 1414–1424 m (the lower Ordovician), and 2223–2284 m (the lower Ordovician), respectively. Nevertheless, the latter two condensates actually originated from deep Cambrian accumulation assemblages (over 8000 m) and migrated upward along deep faults to form the current shallow reservoirs. , Further molecular characterization results of thiols in the condensate will be presented in Section . Four natural gases produced in association with the four corresponding condensates were collected.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…The major production layers in the field are bioclastic limestone intervals and sandy conglomerate intervals in the Carboniferous Bachu Formation and carbonate buried hills in the Ordovician strata. There are three sets of regional seals, that is, the upper, middle, and lower mudstone intervals in the Carboniferous strata; these seals and their underlying sandstone and carbonate reservoirs constitute favorable reservoir-seal assemblages …”

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

Occurrence and Origins of Thiols in Deep Strata Crude Oils, Tarim Basin, China

Zhu

Wang

et al. 2019

ACS Earth Space Chem.

Self Cite

View full text Add to dashboard Cite

Thiols (or mercaptans) in crude oils have been considered to be associated with thermochemical sulfate reduction (TSR). However, the molecular composition and the formation mechanism of thiols in crude oils are not clear. This study provides the molecular composition of thiols in several deep strata condensate oils (condensates) from the Tarim Basin. Selective Michael addition products of thiols were characterized using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and comprehensive two-dimensional gas chromatography–MS (GC × GC MS). The carbon numbers and double bond equivalents of the thiols ranged between 4–20 and 0–10, respectively. Abundant diamondoidthiols found in two condensates were from high-temperature reservoirs. Various thiol compounds with multiple heteroatoms (S2, S3, S1O1, S1O2, and S2O1 class species) were detected in two other condensates, and low reservoir temperature made it possible to prevent the depletion of the multiple-heteroatom thiols. The pronounced 34S enrichment in H2S and high abundance of thiadiamondoids indicate that four condensates were originally sourced from Cambrian strata and suffered severe TSR alteration. The pathway of thiol formation was speculated as follows: TSR-generated H2S reacts with petroleum hydrocarbons. Deep Cambrian strata in the Tarim Basin has the potential of being a huge hydrocarbon resource, although the high maturity and TSR alteration may negatively impact the quantity and quality of reserves and lead to a high H2S content. The results presented here provide new insights into the TSR reaction, which may assist deep oil exploration and facilitate evaluation of the extent of TSR alteration.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Samples and Methodsmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

Occurrence and Origins of Thiols in Deep Strata Crude Oils, Tarim Basin, China

Zhu

Wang

et al. 2019

ACS Earth Space Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Tarim Basin is a large superimposed basin with the rich hydrocarbon resources and a complicated geology in western China (Zhu et al., 2019). More than 4 billion tons of hydrocarbons have been discovered in the Basin.…”

Section: Possible New Methods To Identify Effective Source Rockmentioning

confidence: 99%

Possible new method to discriminate effective source rocks in petroliferous basins: A case study in the Tazhong area, Tarim Basin

Pang

Chen

Pang

et al. 2019

Energy Exploration & Exploitation

View full text Add to dashboard Cite

Sediments with organic matter content (total organic carbon) TOC ≤ 0.5% which can act as effective source rocks are critical and challenging in the field of petroleum geology. A new method is proposed through a case study to identify and evaluate the effective source rocks, which is applied to study the changing characteristic of hydrocarbon-generation potential index with depth. The burial depth corresponding to the beginning of hydrocarbon-generation potential index reduction represents the hydrocarbon expulsion threshold in source rocks. Then, new identification standards are established for discrimination of effective source rocks of Middle–Upper Ordovician in Tarim Basin. The critical value of TOC for effective source rocks change with their burial depth: the TOC > 0.5% with source rock depth > 4000 m, TOC > 0.4% with depth >4500 m, TOC > 0.3% with depth > 5000 m, TOC > 0.2% with depth >5500 m. Based on the new criteria, effective source rocks in the Middle–Upper Ordovician are identified and their total potential hydrocarbon resources is evaluated, reaches 0.68 × 109 t in the Tazhong area, which is 65.4% higher than that of previous studies and consistent with the exploration result. Thus, this new method is of significance to resource evaluation and can be applied in the carbonate source rocks and mudstone source rocks with high degree of exploration.

show abstract

“…The Tarim Basin is located in the southern part of Xinjiang Uygur Autonomous Region, western China [32]. It is a famous multi-cycle large superimposed basin [33].…”

Section: Geological Backgroundmentioning

confidence: 99%

Three-Dimensional Geophysical Characterization of Deeply Buried Paleokarst System in the Tahe Oilfield, Tarim Basin, China

Tian

Wang

Fang

et al. 2019

Water

View full text Add to dashboard Cite

Paleokarst reservoirs are the major type of the Ordovician carbonate reservoirs in the Tahe Oilfield. Due to the strong heterogeneity in distribution, it is a real challenge to detect the spatial distribution of paleokarst reservoirs, especially those deeply buried more than 5500 m in the Tahe area. Based on the abundant core samples, this paper first described the structure of paleocaves drilled by well. Second, after time–depth conversions, the results from drilled wells were tied to three-dimensional (3D) seismic datasets, and then the threshold of host rocks and caves in wave impedance were identified. Third, the seismic-scale mapping and visualization of the paleokarst reservoirs were achieved by tracing the distribution of paleocaves. This approach was applied in the well T403 area, and the structure of the paleokarst, especially the runoff zone, was interpreted. 3D structure and spatial distribution of the paleokarst system was demonstrated by plane, vertical, and 3D models. Additionally, according to the hydrology genetic relationships, the paleocaves in the runoff zone were divided into sinkholes, main channel, and branch channel. The approach of a 3D geophysical characterization of a deeply buried paleokarst system can be applicable to Tahe and other similar paleokarst oilfields, which will guide hydrocarbon exploration in paleokarst reservoirs.

show abstract

TSR, deep oil cracking and exploration potential in the Hetianhe gas field, Tarim Basin, China

Cited by 40 publications

References 44 publications

Occurrence and Origins of Thiols in Deep Strata Crude Oils, Tarim Basin, China

Occurrence and Origins of Thiols in Deep Strata Crude Oils, Tarim Basin, China

Possible new method to discriminate effective source rocks in petroliferous basins: A case study in the Tazhong area, Tarim Basin

Three-Dimensional Geophysical Characterization of Deeply Buried Paleokarst System in the Tahe Oilfield, Tarim Basin, China

Contact Info

Product

Resources

About