Exploration Practice and Total Petroleum System in Residual Marine Sag，Eastern Junggar Basin

doi:10.7657/XJPG20240201

Abstract

Abstract:

The Shiqiantan sag in the eastern Junggar basin is a residual marine sag. In recent years, high-yield natural gas have been obtained from many wells in the Shiqiantan formation, and oil and gas shows have been observed in different strata across the sag, indicating its excellent exploration potential and characteristics as a total petroleum system. Based on seismic, drilling, logging, and organic geochemical data, the formation and evolution of the Shiqiantan sag, the conditions for the formation of the total petroleum system, and the models of hydrocarbon accumulation are studied. The results show that during the Late Carboniferous the north Tianshan oceanic crust subduction and seawater intrusion in the region led to the development of terrigenous, marine, medium- to high-quality source rocks which are now in the mature- to high-mature stage. The reservoir contains volcanic rocks in the Carboniferous strata, marine clastic rocks in the Shiqiantan formation, and continental clastic rocks in the Permian Jingou formation, in all of which hydrocarbons were accumulated. Controlled by the hydrocarbon generation and evolution in the source rocks of the Shiqiantan formation and the characteristics of multiple types of reservoirs, a distribution pattern of shale gas reservoir in the sag-tight oil and gas reservoir in the slope-conventional oil and gas reservoir in the high position is formed, showing a total petroleum system featured with orderly symbiosis of unconventional and conventional oil and gas reservoirs. According to the theory of total petroleum system, the exploration in the Shiqiantan sag should focus on tight oil and gas reservoirs in the near-source slope area, structural-lithological oil and gas reservoirs and volcanic weathering-crust oil and gas reservoirs in the above-source fault-terrace area and structural high, and marine shale gas reservoirs within the source. The Carboniferous near-source favorable lithofacies belts, piedmont thrust fault-concealed structures, intra-basin palaeouplifts, and slope areas are favorable exploration zones in northern Xinjiang. Specifically, exploration efforts should be made towards shale oil and gas reservoirs within the sag, tight sandstone oil and gas reservoirs around the sag, conventional oil and gas reservoirs in the structural highs, and volcanic weathering-crust oil and gas reservoirs in uplifted areas.

Key words: Junggar basin, Shiqiantan sag, Carboniferous, residual marine, Shiqiantan formation, oil and gas exploration, total petroleum system

CLC Number:

TE121.1

ZHI Dongming, CHEN Xuan, YANG Runze, LIU Juntian, YU Haiyue, MA Qiang. Exploration Practice and Total Petroleum System in Residual Marine Sag，Eastern Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(2): 127-138.

Figures/Tables 11

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井名	层位	生烃潜量/（mg·g^-1）	热解峰温/℃	总有机碳含量/%	氢指数/（mg·g^-1）	氯仿沥青“A”含量/%
石钱1井	石钱滩组二段	（0.12~1.07）0.61	（473~492）479	（0.17~2.48）1.31	（27.1~53.2）37.3	0.04
石钱1井	石钱滩组一段	（0.10~1.72）0.79	（433~510）489	（0.11~6.68）3.66	（12.1~72.7）20.7	0.05
石钱2井	石钱滩组二段	（1.12~2.31）1.75	（452~453）452	（1.23~1.83）1.62	（68.3~95.2）79.9
石钱4井	石钱滩组二段	（0.81~3.31）1.61	（464~472）469	（0.78~1.93）1.19	（80.8~131.1）98.5	（0.05~0.11）0.06
石钱4井	石钱滩组一段	（2.04~9.33）4.30	（451~479）473	（2.21~6.21）3.23	（70.5~136.9）107.9	（0.12~0.51）0.29
石钱201井	石钱滩组二段	（3.44~4.49）3.92	（462~473）469	（0.78~1.93）1.19	（80.8~131.1）98.5
石钱3井	石钱滩组一段	（0.93~2.15）1.45	（482~492）487	（1.08~2.33）1.55	（4.9~105.9）48.1

构造或地区	构造背景	区域构造应力类型	优质页岩埋深/m	优质页岩厚度/m	总有机碳含量/%	孔隙度/ %	总含气量/ （m³·t^-1）	压力系数	天然裂缝发育情况
石钱滩凹陷	凹陷斜坡区	挤压	2 600~4 100	50~120	1.0~6.6	2.2~5.1	2.3~4.6	1.09~1.33	较为发育
长宁示范区	向斜北翼平缓斜坡带	挤压	2 450~2 650	30~46	2.8~6.3	2.9~5.1	2.2~5.5	1.30~2.02	局部发育
威远示范区	古隆起斜坡区	挤压	1 800~3 697	24~40	2.2~5.3	2.4~5.9	2.5~4.4	1.40~1.95	局部发育
涪陵焦石坝	箱状背斜	挤压为主	2 100~2 500	30~45	2.0~8.0	4.0~7.0	4.7~5.7	1.35~1.65	发育
昭通示范区	向斜轴部—背斜北斜坡带	压扭（走滑+挤压）	2 030~2 950	31~38	2.1~6.7	2.0~5.0	2.0~4.5	1.60~1.96	较发育

样品来源	包裹体类型	宿主矿物	均一温度/℃	冰点温度/℃	盐度/%	捕获压力/MPa	成藏期次
石钱1井、石钱3井、石钱4井	油包裹体伴生盐水包裹体	石英加大边和石英内裂纹	90.5~109.8	-1.2~-0.7	1.2~2.1	18.4~20.6	Ⅰ
石钱1井、石钱3井、石钱4井	油包裹体伴生盐水包裹体	石英加大边和石英内裂纹	165.9~183.3	-1.9	3.2	42.5~45.8	Ⅱ