东海西湖凹陷平湖组Ⅲ型干酪根暗色泥岩生排烃模拟

doi:10.11743/ogg20200212

Abstract

Abstract:

In order to finely describe the hydrocarbon generation and expulsion process of source rocks and provide reasonable key parameters for quantitative evaluation of oil and gas resources, we carried out a simulation research under semi-open system on hydrocarbon generation and expulsion for the dark mudstone with Type-Ⅲ kerogen in the Eocene Pinghu Formation in the Xihu Sag, East China Sea Shelf Basin.The results show that the process of hydrocarbon generation and expulsion can be divided into five stages as follows, 1) R_o=0.5%-0.7%, when oil was generated slowly without expulsion; 2) R_o=0.7%-1.0%, when oil was generated and expelled rapidly; 3) R_o=1.0%-1.5%, when oil began to be cracked into hydrocarbon gas; 4) R_o=1.5%-2.3%, when gas generation predominated; and 5) R_o>2.3%, when only dry gas was generated.Oil expulsion threshold (R_o) of the source rock of this type is about 0.7% (R_o=0.7%), having a wide gas-window of R_o=1.0%-3.0%.So it can maintain relatively strong gas generation ability at high-and over-mature stages, belonging to gas-prone source rock.Following the study on experimental results and the characteristics of hydrocarbon generation and expulsion in samples, we established a set of mathematical models for the evaluation of the process and potential of gas generation and oil generation and expulsion of the dark mudstone with Type-Ⅲ kerogen in the study area.Compared with the thermal simulation experiment in a closed system, the cumulative yield of oil in the semi-open system is higher and closer to that under actual geological conditions.Accordingly, we may conclude that more oil and gas resources may exist in the Xihu Sag.

Key words: simulation of hydrocarbon generation and expulsion, formation thermal simulation, dark mudstone with Type-Ⅲ kerogen, Pinghu Formation, Xihu Sag, East China Sea Shelf Basin

CLC Number:

TE122.1

Chenjie Xu, Jiaren Ye, Jinshui Liu, Qiang Cao, Yiyong Sheng, Hanwen Yu. Simulation of hydrocarbon generation and expulsion for the dark mudstone with Type-Ⅲ kerogen in the Pinghu Formation of Xihu Sag in East China Sea Shelf Basin[J]. Oil & Gas Geology, 2020, 41(2): 359-366.

Figures/Tables 10

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序号	模拟埋深/m	模拟温度/℃	预期R_o/%	静岩压力/MPa	排烃釜压力/MPa	排烃压差/MPa	排烃温度/℃	恒温时间/h	样品质量/g
1	2 800	335	0.80	64.40	33.60	2.80	140	48	79.52
2	3 900	360	1.25	93.60	50.70	5.85	160	48	79.76
3	4 450	400	1.50	111.25	57.85	6.68	180	48	79.70
4	5 200	455	1.80	130.00	72.80	10.40	190	48	79.88
5	5 900	480	2.00	153.40	82.60	11.80	210	48	79.58
6	6 200	525	2.50	161.20	93.00	15.50	220	48	79.69
7	6 400	575	>3.00	166.40	96.00	16.00	220	48	79.62

序号	模拟温度/℃	实验R_o/%	排出油累计产率/(mg·g^-1)	残留油累计产率/(mg·g^-1)	累计产油率/(mg·g^-1)	累计排出油占比/%	烃气体积累计产率/(mL·g^-1)	烃气质量累计产率/(mg·g^-1)	甲烷含量/%	累计产烃率/(mg·g^-1)
1	335	0.80	19.65	19.76	39.41	37.61	16.72	21.23	58.82	60.63
2	360	0.98	49.77	18.29	68.06	95.27	19.12	25.15	62.14	93.21
3	400	1.48	51.61	5.83	57.44	98.79	38.48	47.21	73.71	104.64
4	455	1.74	51.62	3.51	55.13	98.82	77.16	79.17	83.25	134.30
5	480	2.07	51.90	2.32	54.22	99.35	101.12	100.70	93.10	154.92
6	525	2.30	51.98	1.40	53.38	99.51	129.27	117.12	96.10	170.51
7	575	2.91	52.24	0.49	52.73	100.00	158.44	136.87	98.63	189.61

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Simulation of hydrocarbon generation and expulsion for the dark mudstone with Type-Ⅲ kerogen in the Pinghu Formation of Xihu Sag in East China Sea Shelf Basin

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